Question
Question: The nature of image of an object located 40 cm from a concave mirror is real and magnified four time...
The nature of image of an object located 40 cm from a concave mirror is real and magnified four times. Then the radius of curvature of mirror is –
A
32 cm
B
64 cm
C
48 cm
D
80 cm
Answer
64 cm
Explanation
Solution
m = 
̃ – 4 = 
\ f = – 4f – 160, f = – 32 cm
\ R = 2f = – 64 cm