11. Lenses A and B of focal lengths 7.5 cm and 20 cm respectively are place at distances 15 cm and 60 cm from a point source of light S. The sour 18 on the common principal axis of the lenses. Aperture radii of the Tenses are 2.0 cm and 10 em respectively. If a screen is placed behind the lens B, a circular light spot will be obtained on it. At what distanc from lens B should the sereen be placed so that light spot on it ha find the radius of this spot. Pns: 35Cm; Cm 15 cm 60 cm
11. Lenses A and B of focal lengths 7.5 cm and 20 cm respectively are place at distances 15 cm and 60 cm from a point source of light S. The sour 18 on the common principal axis of the lenses. Aperture radii of the Tenses are 2.0 cm and 10 em respectively. If a screen is placed behind the lens B, a circular light spot will be obtained on it. At what distanc from lens B should the sereen be placed so that light spot on it ha find the radius of this spot. Pns: 35Cm; Cm 15 cm 60 cm
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Transcribed Image Text:lenses are 2.0 cm and 10 cm respectively. If a screen is placed behind
is on the common principal axis of the lenses. Aperture radii of the
at distances 15 cm and 60 cm from a point source of light S. The source
11. Lenses A and B of focal lengths 7,5 cm and 20 cm respectively are placed
source
B.
18 on the common principal axis of the lenses. Aperture radii of the
lenses are 2.0 cm and 10 cm respectively. If a screen is placed behind
the lens B, a circular light spot will be obtained on it. At what distance
from lens B should the screen be placed so that light spot on it ha
minimum radius? Also, find the radius of this spot. Pns: 35 CmiCm
15 cm
60 cm
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