CBSE Class 10 Science 2020 · Paper 31/C/1 · Question 23(b)

Light - Reflection and Refraction 3 marks Medium

Study the ray diagram given below and answer the questions that follow :

Answer

A converging lens; the image is real, inverted and enlarged; the magnification is $- 1$ when the object is at $2 F_{1}$ .

(a) The lens is converging (convex): the ray parallel to the principal axis is bent towards the axis and passes through the focus

F_{2}

after refraction. (b) The image is real, inverted and enlarged (magnified); it is formed beyond

2 F_{2}

, on the other side of the lens. (c) When the object is placed at

2 F_{1}

(at a distance

2 f

from the lens), the image is formed at

2 F_{2}

, real, inverted and of the same size, so the magnification is

- 1

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