The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and the image at a distance of 26 cm from the convex lens, calculate the new size of the image

a)

1.25 cm

b)

2.5 cm

c)

1.05 cm

d)

2 cm

Question ID - 152672 :-

The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and the image at a distance of 26 cm from the convex lens, calculate the new size of the image

a)

1.25 cm

b)

2.5 cm

c)

1.05 cm

d)

2 cm

1 Answer

5876 Votes

3537

Answer Key : (b) -

(b)

Image formed by convex lens at will act as a virtual object for concave lens. For concave lens

Or cm

Magnification for concave lens

As size of the image at is 2 cm. Therefore, size of image at will be cm.

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