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In the given figure, a plano-concave lens is placed on a paper on which a flower is drawn. How far above its actual position does the flower appear to be?

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Important Questions on Ray Optics

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 107

A beam of diameter d is incident on a glass hemisphere as shown in the figure. If the radius of curvature of the hemisphere is very large in comparison to d, then the diameter of the beam at the base of the hemisphere will be:

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 108
A convexo-concave diverging lens is made of glass of refractive index 1.5 and focal length 24 cm. Radius of curvature for one surface is double that of the other. Then radii of curvature for the two surfaces are (in cm):
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 109
Two symmetric double convex lenses A and B have the same focal length, but the radii of curvature differ so that, RA=0.9 RB. If nA=1.63, find nB.
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 110
When a lens of power P (in air) made of material of refractive index μ is immersed in a liquid of refractive index μ0. Then the power of the lens is:
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 111
A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is (refractive index of water=1.33)
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 112
The diameter of the sun subtends an angle of 0.5° at the surface of the earth. A converging lens of focal length 100 cm is used to provide an image of the sun onto a screen. The diameter (in mm) of the image formed is nearly
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 113
A thin lens of focal length f and its aperture diameter d, forms a real image of intensity I. Now the central part of the aperture up to diameter (d2) is blocked by an opaque paper. The focal length and image intensity would change to:
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 114

A thin symmetrical double convex lens of power P is cut into three parts, as shown in the figure. Power of A is:

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