Question

# A student has obtained an image of a well-illuminated distant object on aÂ screen to determine the focal length, $${F_1}$$ of the given spherical mirror. TheÂ teacher then gave him another mirror of focal length, $${F_2}$$ and asked himÂ to obtain a focused image of the same object on the same screen. TheÂ student found that in order to focus the same object using the secondÂ mirror, he has to move the mirror away from the screen. From thisÂ observation it may be concluded that both the spherical mirrors given toÂ the student were (select the correct option)

A
Concave and F1< F2
B
Concave and F1> F2
C
Convex and F1 < F2
D
Convex and F1 > F2

Solution

## The correct option is C Concave and $${F_1}$$< $${F_2}$$Both the mirrors have to be concave, as the light is converged and focused on the screen from a distant object. Also, Since the second mirror is moved further from the screen, it means it has a greater focal length than the first concave mirror. So, we can conclude that the mirror is concave and $$F_{1}$$ < $$F_{2}$$PhysicsNCERTStandard XII

Suggest Corrections
Â
0

Similar questions
View More

Same exercise questions
View More

People also searched for
View More