Q. Diameter of aperture of a plano-convex lens is 8 cm
and its thickness at center is 4 mm. If speed of
light in the material of lens is 9÷5 ×10^8m/s, then
focal length of the lens will be
(1) 30 cm
(2) 20 cm
(3) 10 cm
(4) 15 cm
plzz solve it
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Answer:
(4) is a correct answer dear hope this answer help you
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