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ICSE Class 10 Physics Question 9 of 27

Solved 2024 Specimen Paper ICSE Class 10 Physics — Question 23

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Question 3(i)

(a) Refer to the diagram given below. A lens with two different refractive indices is shown. If the rays are coming from a distant object, then how many images will be seen?

Refer to the diagram. A lens with two different refractive indices is shown. If the rays are coming from a distant object, then how many images will be seen? ICSE 2024 Specimen Physics Solved Question Paper.

(b) A glass lens always forms a virtual, erect and diminished image of an object kept in front of it. Identify the lens.

Answer

(a) Two images will be seen.
Reason — According to the lens maker formula :

1f\dfrac{1}{\text{f}} = (μ - 1)(1R1\dfrac{1}{\text{R}_1} - 1R2\dfrac{1}{\text{R}_2})

Focal length is a function of refractive index, hence for two different refractive index there will be two different focal lengths.

Two different focal length implies two different images for same object. Hence 2 images will be formed.

(b) Concave lens