Ray Optics Test

Result

Ray Optics Test - 134

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Weekly Quiz Competition

Question 1
4 / -1

A light ray is incident by grazing one of the face of a prism and after refraction ray does not emerge out, what should be the angle of prism while critical angle is C

A
Equal to 2C

B
Less than 2C

C
More than 2C

D
None of these

Solution
Question 2
4 / -1

A parallel beam of monochromatic light is incident at one surface of an equilateral prism. Angle of incidence is 55° and angle of emergence is 46°. The angle of minimum deviation will be

A
Less than 41°

B
Equal to 41°

C
More than 41°

D
None of these

Solution
Question 3
4 / -1

The spectrum of light emitted by a glowing solid is

A
Continuous spectrum

B
Line spectrum

C
Band spectrum

D
Absorption spectrum
Question 4
4 / -1

Light rays from a source are incident on a glass prism of index of refraction µ and angle of prism α. At near normal incidence, the angle of deviation of the emerging rays is

A
(µ– 2)α

B
(µ– 1)α

C
(µ + 1)α

D
(µ + 2)α

Solution
Question 5
4 / -1

Which of the following element was discovered by study of Fraunhoffer lines?

A
Hydrogen

B
Oxygen

C
Helium

D
Ozone
Question 6
4 / -1

By placing the prism in minimum deviation position, images of the spectrum

A
Becomes inverted

B
Becomes broader

C
Becomes distinct

D
Becomes intensive
Question 7
4 / -1

Our eye is most sensitive for which of the following wavelength

A
4500 Å

B
5500 Å

C
6500 Å

D
Equally sensitive for all wave lengths of visible spectrum
Question 8
4 / -1

Three prisms of crown glass, each have angle of prism 9° and two prisms of flint glass are used to make direct vision spectroscope. What will be the angle of flint glass prisms if µ for flint is 1.60 and µ for crown glass is 1.53?

A
11.9°

B
16.0°

C
15.3°

D
9.11°

Solution
Question 9
4 / -1

If the refractive indices of crown glass for red, yellow and violet colours are 1.5140, 1.5170 and 1.5318 respectively and for flint glass these are 1.6434, 1.6499 and 1.6852 respectively, then the dispersive powers for crown and flint glass are respectively

A
0.034 and 0.064

B
0.064 and 0.034

C
1.00 and 0.064

D
0.034 and 1.0

Solution
Question 10
4 / -1

The minimum temperature of a body at which it emits light is

A
1200°C

B
1000°C

C
500°C

D
200°C