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The size of the image of an object, whic...

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

Text Solution

Verified by Experts

The correct Answer is:
B
For convex lens
Size of image = 2 cm
For concave lens
`(1)/(v) - (1)/(4) = - (1)/(20) rArr v = 5 cm `

`m. = (v)/( u) = (5)/( 4) rArr ("size of image")/(2) = 1.25 cm `
`rArr` New size of image ` = 2.5 cm `
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