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+1 vote
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in Physics by (63.7k points)

An object O is placed at a distance of 15 cm from a convex lens A of focal length 10 cm and its image I1 is formed on a screen on the other side of the lens. A concave lens B is now placed midway between A and I1 , then the screen is moved back 10 cm to receive a clear image I2 . 

Find (a) The focal length of the concave lens and 

(b) Linear magnification of the final image.

1 Answer

+1 vote
by (57.5k points)
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Best answer

The convex lens forms the image of the object at point I1 . This image acts as the object for concave lens and the final image is formed at I1’. 

For refraction through convex lens,

The negative sign implies it is a concave lens.

Linear magnification 

The negative sign shows that the final image is inverted. 

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