Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 19

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A glass concave lens is placed in a liquid in which it behaves like a convergent lens. If the refractive indices of glass and liquid with respect to air are ${}_{a}μ_{g}$ and ${}_{a}μ,$ respectively, then

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Important Questions on Ray Optics and Optical Instruments

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 20

The diameter of aperture of a plano-convex lens is

6 cm

and its maximum thickness is

3 mm .

If the velocity of light in the material of the lens is

2 \times 10^{8} m / s,

its focal length is (approximately)

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 21

Two plano-convex lenses of equal focal lengths are arranged as shown

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The ratio of the combined focal lengths is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 22

When an object is at a distance

u_{1}

and

u_{2}

from a lens, real image and a virtual image is formed respectively having same magnification. The focal length of the lens is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 23

A concave lens of focal length

f

produces an image

(1 / x)

of the size of the object. The distance of the object from the lens is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 24

A thin equiconvex glass lens of refractive index

1.5

has power of

5 D .

When the lens is immersed in a liquid of refractive index

μ,

it acts as a divergent lens of focal length

100 cm .

The value of

μ

of liquid is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 25

A convex lens of focal length

100 cm

and a concave lens of focal length

10 cm

are placed coaxially at a separation of

90 cm .

If a parallel beam of light is incident on convex lens, then after passing through the two lenses the beam

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 26

Yellow light is refracted thorough a prism producing minimum deviation. If

i_{1}

and

i_{2}

denote the angle of incidence and emergence for this prism, then

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 27

At what angle will a ray of light be incident on one face of an equilateral prism, so that the emergent ray may graze the second surface of the prism

(μ = 2) ?