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ICSE Class 10 Physics Question 9 of 27

Solved 2023 Question Paper ICSE Class 10 Physics — Question 23

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Question

Question 3(i)

(a) Is it possible for a concave lens to form an image of size two times that of the object? Write Yes or No.

(b) What will happen to the focal length of the lens if a part of the lens is covered with an opaque paper?

Answer

(a) No.

(b) The focal length of the lens will not change.
Reason — The focal length of a lens is a characteristic property of the lens itself and is determined by its shape and refractive index. Covering a portion of the lens with opaque paper will not alter the lens's inherent optical properties.