Question

39 If the object is placed 20cm in front of a convex lens of focal length 75 cm then find th position of image (in cm)​

Answer 1

Answer:

Solution

f=20cm

and v=40cm

v1​−u1​=f1​

⟹401​−u1​=201​

⟹u1​=40−1​

⟹u=−40cm

magnification m=uv​=−4040​=−1

Hence, the image formed is real , inverted and of same size as that of the object.

Explanation: