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Tardigrade
Question
Physics
A candle placed 25 cm from a lens forms an image on a screen placed 75 cm on the other side of the lens. The focal length and type of the lens should be
Q. A candle placed 25 cm from a lens forms an image on a screen placed 75 cm on the other side of the lens. The focal length and type of the lens should be
2350
209
KCET
KCET 2018
Ray Optics and Optical Instruments
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A
+ 18.75 cm and convex lens
64%
B
- 18.75 cm and concave lens
18%
C
+ 20.25 cm and convex lens
11%
D
- 20.25 cm and convex lens
7%
Solution:
f
1
=
v
1
−
u
1
f
1
=
75
1
+
25
1
f
1
=
75
×
25
100
f
=
4
75
=
18.75
c
m