a lens produces an erect image , of size 12 mm when an object of size 6cm is placed 12 cm from its optical centre.
1.nature of the lens
2.magnification produced
3.draw relevant diagram to justify ur ans
4.calculate image distance and focal length
5. power of this lens
6.give an application of thus lens in ur daily life
1.nature of the lens
2.magnification produced
3.draw relevant diagram to justify ur ans
4.calculate image distance and focal length
5. power of this lens
6.give an application of thus lens in ur daily life
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U= -120 mm
ho=60 mm
hi=12 mm
1. concave lens
2.m = hi/ho
m = 12/60 = 1/5 = 0.2 mm = 2 cm
3. 2nd ray diagram of concave lens
4. hi/ho = v/u
12/60 = v/-120
0.2 x -120 = v
v = 24 mm
1/f = 1/v - 1/u
1/f = 1/24 + 1/120
1/f = [10 + 2]/240
1/f = 1/20
f = 20 mm
5 P = 1/f[in m]
P = 1/0.2
P = 5 D
6. concave lens is used in shaving mirrors and dentists.
Explanation:
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