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Grade: 12
        
Biconvex lens has refractive index = 1.5. The radii of curvatures of two sides are 20 cm and 30 cm. Find focal length
4 months ago

Answers : (2)

Khimraj
1910 Points
							
by lens maker formula
1/f = (n-1)(1/R1 – 1/R2)
1/f = (1.5-1)(1/20 – 1/(-30))
1/f = 0.5(1/20 + 1/30)
1/f = 1/22
So f =22cm.
Hope it clears,
4 months ago
Renu
11 Points
							By lens maker formula(n-1) (1/R1-1/R2) = 1/f(1.5 - 1) (1/20-1/(-30))(0.5)(1/20 + 1/30)(0.5)(5/60)(0.5)(1/12)(5/10)(1/12)1/24 = 1/ff = 24
						
4 months ago
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