The ray diagram shows the image formation of an object by a converging lens. How far is the image formed from the lens.

40 cm

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72 cm

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90 cm

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50 cm

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Solution

The correct option is B 72 cm
Given,
u = -90 cm, f = 40 cm

1/v - 1/u = 1/f

1/v = 1/40 - 1/90

This gives v = 72 cm.

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Q. The ray diagram shows the image of an object formed by a converging lens. What is the focal length of the lens?

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The ray diagram shows the image formation of an object by a converging lens. How far is the image formed from the lens.

The correct option is B 72 cmGiven,​ u = -90 cm, f = 40 cm​ 1/v - 1/u = 1/f 1/v = 1/40 - 1/90 This gives v = 72 cm.

The correct option is B 72 cm
Given,
u = -90 cm, f = 40 cm

1/v - 1/u = 1/f

1/v = 1/40 - 1/90

This gives v = 72 cm.