Question

A spherical mirror produces an image has size 5 times greater than the object on a screen, 5 meters away from the object. The mirror is…..
A. concave with the focal length of 25/24 m
B. convex with the focal length of 25/24 m
C. concave with the focal length of 24/25 m
D. convex with the focal length of 24/25 m

Answer 1

Explanation:

An image formed on a screen is a real image. Thus, the mirror must be concave since, of mirrors, only concave mirrors can form real images of real objects.

(b) The magnified, real images formed by concave mirrors are inverted, so and

M = (-q/p)= -5

Or p=q/5 =(5.0/5)=1.0 m

The object should be 1 m in front of the mirror.

The focal length of the mirror is

1/f=1/1+ (1/5) = (6/5)

Or f= (5.0/6) =0.83m

Answer 2

Answer:

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y/x =5

y = 5x = 5 , x = 1

1/f = 1/5 + 1 = 6/5 , f = 5/6 m

Hope it will be helpful :)...✍️