Question

The focal length of a concave mirror, which produces a virtual image at a distance of 50 cm of an object placed 20 cm in front of it is

Answer 1

Answer:

Given

Image distance, v=50cm

Object distance u=20cm

Since, the image is virtual it will be formed on the same side of the object.

From lens formula,

f

1

=

v

1

−

u

1

f

1

=

−50

1

−

−20

1

=

100

3

f=

3

100

cm= focal length

Explanation:

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Answer 2

Answer:Solution :

33.3 cm

Explanation: