. An object is 6 cm high. It is desired to form a real image 2 cm high at
80 cm from a mirror. What type of mirror is required for this purpose
and what shall be its focal length ?
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It is desired to form a real image 2cm high at 60cm from the mirror. What type of ... Focal lenght of convex mirror = ? cm. Object distance u = ? cm. Image distance v = 60 cm.
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Answer:
Height of object ho = 4 cm
Focal lenght of convex mirror = ? cm
Object distance u = ? cm
Image distance v = 60 cm
Image height hi = 2 cm
Magnification m = hi/ho = 2/4=1/2
v/u = 1/2
60cm/u = 1/2
u = 120 cm
mirror formula: 1/v + 1/u = 1/-f
1/-f = 1/v + 1/u
= 1/60 + 1/120
= 3/120 = 1/40
⇒ f= -40 cm
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