Chapter 11: Light

Q1Written answer

Fill in the blanks.

(a) An image that cannot be obtained on a screen is called a ____________.

(b) Image formed by a convex __________ is always virtual and smaller in size.

(c) An image formed by a __________ mirror is always of the same size as that of the object.

(d) An image which can be obtained on a screen is called a _________ image.

(e) An image formed by a concave ___________ cannot be obtained on a screen.

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(a) An image that cannot be obtained on a screen is called a virtual image.

(b) Image formed by a convex mirror is always virtual and smaller in size.

(c) An image formed by a plane mirror is always of the same size as that of the object.

(d) An image which can be obtained on a screen is called a real image.

(e) An image formed by a concave lens cannot be obtained on a screen.

Q2Written answer

Mark ‘T’ if the statement is true and ‘F’ if it is false.

(a) We can obtain an enlarged and erect image by a convex mirror. (T/F)

(b) A concave lens always form a virtual image. (T/F)

(c) We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)

(d) A real image cannot be obtained on a screen. (T/F)

(e) A concave mirror always forms a real image. (T/F)

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Worked solution

a) False

b) True

c) True

d) False

e) False

Q3Written answer

Match the items given in Column I with one or more items in Column II.

Column-I	Column-II
(a) A plane mirror	(i) Used as a magnifying glass.
(b) A convex mirror	(ii) Can form images of objects spread over a large area.
(c) A convex lens	(iii) Used by dentists to see an enlarged image of teeth.
(d) A concave mirror	(iv) The image is always inverted and magnified.
(e) A concave lens	(v) The image is erect and of the same size as the object.
	(vi) The image is erect and smaller in size than the object.

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Column-I	Column-II
(a) A plane mirror	(v) The image is erect and of the same size as the object.
(b) A convex mirror	(ii) Can form an image of objects spread over a large area.
(c) A convex lens	(i) Used as a magnifying glass.
(d) A concave mirror	(iii) Used by dentists to see an enlarged image of teeth.
(e) A concave lens	(vi) The image is erect and smaller in size than the object.

Q4Written answer

State the characteristics of the image formed by a plane mirror.

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Worked solution

Characteristics of the image formed by a plane mirror are as follows:

Image distance and object distance are equal.
The size of the object and image are equal.
The image formed is erect and virtual.
Images are laterally inverted.

Q5Written answer

Find out the letters of the English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.

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Worked solution

A, H, I, M, O, T, U, V, W, X, and Y alphabets form images in a plane mirror exactly like the letter itself because these alphabets are laterally symmetric.

Q6Written answer

What is a virtual image? Give one situation where a virtual image is formed.

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Worked solution

The image that cannot be obtained on a screen is called a virtual image. The image formed by a plane mirror is virtual.

Q7Written answer

State two differences between a convex and a concave lens.

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Convex Lens	Concave Lens
Thick in the middle and thin at the edge.	Thin in the middle and thick at the edge.
The image formed is real or virtual.	The image formed is virtual.

Q8Written answer

Give one use each of a concave and a convex mirror.

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Worked solution

Concave mirrors are used in the headlights of cars and scooters.

Convex mirrors are used as side-view mirrors in vehicles.

Q9Written answer

Which type of mirror can form a real image?

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Worked solution

The concave mirror can form a real image.

Q10Written answer

Which type of lens always forms a virtual image?

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Worked solution

A concave lens forms a virtual image.

Choose the correct option in questions 11–13.

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