The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in

(a)

A

(b)

B

(c)

C

(d)

D

In a myopic eye, the image of the object is formed

(a)

behind the retina

(b)

on the retina

(c)

in front of the retina

(d)

on the blind spot

The eye defect ‘presbyopia’ can be corrected by

(a)

convex lens

(b)

concave lens

(c)

convex mirror

(d)

Bi focal lenses

If V_B, V_G, V_R be the velocity of blue, green and red light respectively in a glass prism, then which of the following statement gives the correct relation?

(a)

V_B = V_G = V_R

(b)

V_B > V_G >V_R

(c)

V_B < V_G < V_R

(d)

V_B < V_G > V_R

The path of light is ______

(a)

rays

(b)

point

(c)

lines

(d)

beam

The group of rays is ______

(a)

lines

(b)

dots

(c)

beam

(d)

none of these

The velocity of light is _______

(a)

3 x 10^-8 ms^-1

(b)

3 x 10⁸  ms^-1

(c)

3 x 10⁸ km s^-1

(d)

3 x 10^-8 km s^-1

Velocity and wavelength of light are related by a relation

(a)

g-c⋋

(b)

\(\gamma =\frac { c }{ \lambda } \)

(c)

c=\(\gamma \)⋋

(d)

both b & c

If the energy of the incident and scattered beam of light are same, then it is called ______ scattering

(a)

Ray light

(b)

Inelastic

(c)

Mie

(d)

Elastic

The scattering of light by colloidal particles is _____  scattering.

(a)

Ray light

(b)

Mie

(c)

Raman

(d)

Tyndall

The refractive index of a transparent medium is always greater than__________

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one

If the energy of incident beam and the scattered beam are same, then the scattering of light is called as________scattering.

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elastic

Amount of light entering into the eye is controlled by________

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Iris

Blue and green light has different _____ and ______

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wavelength, frequency

Refraction is due to difference in _____ of light in different media.

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velocity

Angle of refraction is _____ for red and _____ for violet.

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smallest, highest

1D is equal to _______

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1 m^-1

______ tough membrane protects the internal parts of the eye.

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sclera

Ciliary muscles help to change _____ of the eye lens according to the position of the object.

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focal length

The focal length of the eye lens is adjusted by ______

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ciliary muscles

Ciliary muscles

(1)

Refraction

Hypermetropia

(2)

Scattering of light

Object which give out light

(3)

near point moves away

Object which emit their own light

(4)

Power of accommodation

violet light

(5)

highest frequency

red light

(6)

highest wavelength

Deviation of ray

(7)

Reflection

Objects can be seen

(8)

Dispersion

Splitting up of colours

(9)

Luminous

Blue colour of the sea

(10)

source