The focal length of a plano-convex lens is 20 cm in air. Refractive index of glass is 1.5. Calculate (i) the radius of curvature of lens surface and (ii) its focal length when immersed in liquid of refractive index 1.6
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An eye-piece consists of a concave lens of focal length 2f and a convex lens of focal length 3f separted by a distance `(f)/(2)`. They are of the same
Correct Answer - Free from chromatic aberration but not spherical, yes
2 Answers 1 views
A plano convex lens `(mu=1.5)` has a maximum thickness of `1mm` .If diameter of its aperture `4cm` Find (i)Radius of curvature of curved surface (ii)
Correct Answer - (a) 20 cm; (b) 40 cm
2 Answers 1 views
The redius of curvature of the convex face of a plano-convex lens is 12cm and its refractive index is 1.5. a. Find the focal length of this lens. The
Correct Answer - (a) `+24 cm`; (b) `- 36cm` (c) `12 cm`(d) `- 180 cm`
2 Answers 1 views
A convex lens of crown glass is perfectly cemented to a plano-concave lens of flint glass to form an achromatic combination of power `div 5D`. Calcula
Correct Answer - `8.6cm, 12 cm`
2 Answers 2 views
A convex surface of radiys of curvature 20 cm separates air from glass of refractive index 1.5. Find the position and the nature of the image of a sma
Correct Answer - v = 13m, real image in glass medium
2 Answers 1 views
A double convex lens has radii 20 cm. The index of refraction of glass is 1.5. Compute the focal length of this lens in air and when immersed in carbo
Correct Answer - 20 cm, - 125.4 cm
2 Answers 1 views
The focal length of a concave-convex lens of radii of curvature 5 cm and 10 cm is 20 cm. what will be its focal length in water ? Given `.^(a)mu_(w) =
Correct Answer - `-80 cm`
2 Answers 2 views
A convex lens of refractive index 1.5 is immersed in a liquid of refractive index (i) 1.6 (ii) 1.3 and (iii) 1.5. what changes happens to the focal le
Correct Answer - (i) - 8f (ii) `+3.25f` (iii) `oo`
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The two surfaces of a double concave lens are of curvature 10 cm and 40 cm. Find the focal length of the lens in water. The refractive index of water
Correct Answer - `-64 cm`
2 Answers 1 views
The radii of curvature of each surface of a convex lens is `20 cm` and the refractive index of the material of the lens is `3//2` (i) Calculate its fo
Correct Answer - (i) 20 cm (ii) 40 cm (iii) f remains
2 Answers 1 views