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An object of size 7.5 cm is placed in fr...

An object of size 7.5 cm is placed in front of a convex mirror of radius of curvature 25 cm at a distance of 40 cm. The size of the image should be

A

2.3 cm

B

1.78 cm

C

1 cm

D

0.8 cm

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Magnification,
`m=I/O=(f)/(f-u)`
`therefore` `I/7.5=((R//2))/((R//2)-u)=((25//2))/((25//2-(-40)`
`therefore` The size of the image, I=-1.78 cm
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