Question

A convex lens of focal length f =20cm. If an object placed 30cm from the lens. Find the nature, size of magnification of image if size of object is 30 cm

Answer 1

Explanation:

i) As the lens is convex

u= -30 cm

f= 20 cm

v=?

Using lens formua

1/f=1/v-1/u

1/v = 1/f+1/u

v= uf/u+f

= -600/-10

= 60 cm

As v is positive so image is real

ii) M= v/u = 60/-30 = -2

iii) Image is real.

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Answer 2

Answer:

Hope this will help u..