# Light class 7 worksheet with answers

• Selina Concise Physics Class 7 ICSE Solutions – Light Energy
• MCQ Questions for Class 7 Science Chapter 4 Heat with Answers
• NCERT Solutions For Class 7 Science Chapter 15 Light PDF
• NCERT Solutions for Class 7 Science Chapter 15
• Class 6 Science Chapter 11 Light Shadows and Reflection Worksheet
• ## Selina Concise Physics Class 7 ICSE Solutions – Light Energy

Light always travels in a straight line in the form of rays. Light sources are either natural or artificial. The sun and stars are natural sources of light.

A bulb, a candle etc. The bodies which emit light themsleves are called Luminous Bodies, e. The bodies which do not emit light are called non-luminous bodies, e.

Objects are of three types, transparent, translucent or opaque. The pinhole camera is a simple application of the rectilinear propagation of light. When an object blocks light, it casts a shadow. Eclipses are formed due to formation of shadows. Solar and lunar eclipses are the examples of formation of shadow in nature.

An eclipse is the partial or complete hiding of one heavenly body by shadow of another. When light strikes a polished surface it comes back in the same medium, is called reflection of light. A straight highly polished, smooth and reflecting surface is known as a plane mirror. Mirrors are of two types a plane mirrors b spherical mirrors. Smooth and polished surface like a mirror causes reflection and is called a regular reflection. Rough or diffused surface causes an irregular reflection.

According to first law of reflection. The incident ray, the normal and the reflected ray all lie in the same plane. According to the second law of reflection, the angle of incidence is always equal to the angle of reflection. The phenomenon due to which the left side of an object appears to be the right side of the object and right side appears left.

This is known as lateral inversion. Image is of two types a Real image b Virtual image. Test Yourself 1. Write true or false for each statement a The image formed by a plane mirror is real. The image formed by a plane mirror is virtual. When a light ray is reflected from a wall, the angle of incidence is equal to the angle of reflection. The image formed by a plane mirror cannot be obtained on a screen.

A rose appears red in white light. Match the following 4. Select the correct alternative a A man standing in front of a plane mirror finds his image to be at a distance of 6 metre from himself.

Answer: mirror i. Any non-luminous body can be made luminous by heating it. Answer: True ii. Any material through which light energy pass partially or wholly is called an opaque object. Answer: False iii. A cardboard is an example of an opaque object.

Answer: True iv. A glass is a transparent object. Answer: True v. A shadow is colorful. Answer: False Answer: Light is form of energy which excites the sensation of vision. Is moon a luminous or non-luminous body? Answer: Moon is a non-luminous body. How does light travel? Answer: Light travels in a straight line.

Write one property of light. Name one living thing which emits light? Answer: Jugnu firefly 8. What could be the shape of the shadows? Answer: It will similar to the object. Does the color of opaque object affect the color of the shadow? Answer: No, the color of opaque object does not affect the color of the shadow.

When shadow cannot be formed? Answer: Shadow cannot be formed when light is coming from all direction. Does the flame of gas stove emit light? Answer: Yes, the flame of gas stove emits light because it is visible in the dark. Can light pass through opaque objects? Answer: No, light cannot pass through opaque objects.

Can we see shadow even if there is no light? Answer: No, we cannot see shadow in the absence of light. What is the color of a shadow? Answer: A shadow is black in color. How can non-luminous object be made luminous?

Answer: Non-luminous object can be made luminous by heating it. Why does a pinhole camera produces an inverted upside down image? Answer: A pinhole camera produces an inverted image because light travels in straight line. What do you understand by rectilinear propagation of light? Answer: The light travels in straight line. This phenomenon is called the rectilinear propagation of light. When we are able to see the object? Answer: We are able to see the object when reflected light from the object enters our eyes.

What is a reflector? Give one example. Answer: A surface which reflects the light is called reflector. Example: Plane mirror. Why polished surfaces causes glare in our eyes? Answer: Polished surface produces regular reflections which causes glare in our eyes.

## MCQ Questions for Class 7 Science Chapter 4 Heat with Answers

### NCERT Solutions For Class 7 Science Chapter 15 Light PDF

His mother placed it in front of a mirror. Sai observed something that excited him. What change would have excited Sai? Some questions came to his mind. Can you guess the questions?

## NCERT Solutions for Class 7 Science Chapter 15

Write a few such questions. Some questions are — i Sai must be thinking what us fire? Unexpectedly some water sprinkled on a mirror while Madhu was shaving his face. Did he observe any difference in his image? If yes, explain why? Yes, he will observe some difference the reason behind it is — The mirror is a perfect reflector of light but water is not and therefore the reflection of the man gets changed when water falls on the mirror.

When water fell on the mirror and as a result, his reflection got a little changed. Because a mirror image a plane mirror is a reflected duplication of an object that appears almost sane or identical. Draw the diagram of concave and convex mirrors. Ans: — In convex lens, the curve is outward facing, but in concave lens the curve faces inward. That means when the reflecting surface of a mirror is convex, then it is called convex mirror. But the reflecting surface of a mirror is concave, it is called concave mirror.

Convex mirrors are diverging nature. But concave mirror are converging nature. Convex mirror mean inner side of a mirror is reflecting. Concave mirror mean outer side of a mirror is reflecting. Give some examples.

Ans: — Any places where the surfaces are not plane mean curve.

## Class 6 Science Chapter 11 Light Shadows and Reflection Worksheet

Examples: We see everything is surroundings with the help of our eyes due to continuous irregular reflection. Write about the role of mirrors in our life. Ans: — Mirrors are essential to every home. IT helps us in our daily life. Mirror reflects to us how we took, how clothes fit us, and how things fit. Every were we go, there are almost mirrors are always present. The bodies which emit light themsleves are called Luminous Bodies, e. The bodies which do not emit light are called non-luminous bodies, e.

Objects are of three types, transparent, translucent or opaque. The pinhole camera is a simple application of the rectilinear propagation of light.

When an object blocks light, it casts a shadow. Eclipses are formed due to formation of shadows. Solar and lunar eclipses are the examples of formation of shadow in nature. An eclipse is the partial or complete hiding of one heavenly body by shadow of another. When light strikes a polished surface it comes back in the same medium, is called reflection of light.

A straight highly polished, smooth and reflecting surface is known as a plane mirror. Answer: False Answer: Light is form of energy which excites the sensation of vision. Is moon a luminous or non-luminous body? Answer: Moon is a non-luminous body. How does light travel? Answer: Light travels in a straight line.

Write one property of light. Name one living thing which emits light? Answer: Jugnu firefly 8. What could be the shape of the shadows? Answer: It will similar to the object. Does the color of opaque object affect the color of the shadow? Answer: No, the color of opaque object does not affect the color of the shadow.

When shadow cannot be formed? Answer: Shadow cannot be formed when light is coming from all direction. Does the flame of gas stove emit light?

Answer: Yes, the flame of gas stove emits light because it is visible in the dark. Can light pass through opaque objects? Answer: No, light cannot pass through opaque objects. Can we see shadow even if there is no light?

## thoughts on “Light class 7 worksheet with answers”

1. Taran says:

I think, you will come to the correct decision. Do not despair.