The age of a candie, place at a distance of 30
em from a convex minor is formed at a distance of
10 cm. Find focal length of over and also
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12th
Physics
Ray Optics and Optical Instruments
Problems on Mirror and Magnification Formula
A small candle, 2.5 cm in s...
Physics
A small candle, 2.5cm in size is placed at 27cm in front of a concave mirror of radius of curvature 36cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Describe the nature and size of the image. If the candle is moved closer to the mirror, how would the screen have to be moved?
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Solution To Question ID 421246
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Object distance, u=−27cm
Radius of curvature of the concave mirror, R=−36cm
focal length of mirror f=R/2=−18cm
The image distance can be obtained using the mirror formula,
v
1
+
u
1
=
f
1
From above equation, v=−54cm.
Therefore, the screen should be placed 54 cm away from the mirror to obtain a sharp image. The magnification of the image is given as,
m=
h
h
′
=−
u
v
∴h
′
=−5cm