Question

A convex mirror forms a image with a magnification of 0.4. If the radius is -20cm, find the distance of the object from the mirror.

Answer 1

Answer:

12th

Physics

Ray Optics and Optical Instruments

Spherical Mirrors

A dentist uses a small mirr...

PHYSICS

A dentist uses a small mirror that gives a magnification of 4 when it is held 0.60 cm from a tooth The radius of curvature of the mirror is 0.4 n then is -6 (in cm)

December 26, 2019

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Rajnandini Arora

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ANSWER

Magnification m=

u

v

Now object in front of mirror so u=−ive

4=+

0.6

v

v=

10

4×0.6

=

5

12

Now

r

1

=

v

1

+

u

1

=

v

1

−

u

1

=

12

5

−

6

10

r=−1.60

So it is concave.