Question

10. A light source is kept at a certain distance 'x' from a concave mirror and it is found that the rays
of light coming from light source after reflection becomes parallel to the principal axis. The
radius of curvature and focal length of the mirror are respectively: *
​

Answer 1

Explanation:

object distance, u=−2cm

focal length of the lens, f=5cm

Applying the lens formula, we get

f

1

=

v

1

−

u

1

⟹

5

1

=

v

1

−

(−2)

1

⟹

v

1

=

5

1

−

2

1

⟹

v

1

HOPE THIS IS HELPFUL

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=

10

2−5

⟹v=−3.33cm