Ray Optics and Optical Test

Result

Ray Optics and Optical Test - 70

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Weekly Quiz Competition

Question 1
1 / -0

A lens placed between a candle and fixed screen so that an image is produced on screen with magnification 3. When is moved away from candle by 80$$\mathrm { cm }$$ again a sharp image is produced on screen. Determine the focal length of lens

A
30$$\mathrm { cm }$$

B
60$$\mathrm { cm }$$

C
15$$\mathrm { cm }$$

D
20$$\mathrm { cm }$$
Question 2
1 / -0

A bulb is placed 6 m below the water surface in a pool.What should be the area of a carboard, Which has to be placed over the water surface above bulb such that no light rays comes out of the water surface[take refractive index of water as 4/3]

A
$$500 m^{2}$$

B
$$800 m^{2}$$

C
$$145 m^{2}$$

D
$$100 m^{2}$$

Solution
Question 3
1 / -0

What will be the deviation produced when a ray of light is incident on a plane mirror at an angle of incidence $${ 60 }^{ o }$$?

A
$${ \quad30 }^{ o }$$

B
$${ \quad 90 }^{ o }$$

C
$${ \quad 60 }^{ o }$$

D
$${ \quad 120 }^{ o }$$

Solution
Question 4
1 / -0

The refractive indices of glass and water are 3/ 2 and 4/ 3 respectively. The refractive index of glass with respect to water is

A
2

B
8/9

C
9/8

D
5/3

Solution

Given
$$n_{glass}=3/2$$
$$n_{water}=4/3$$
Now refractive index of glass with respect to water is given by
$$_{water}n_{glass}$$=$$\dfrac{n_{glass}}{n_{water}}$$=$$\dfrac{3/2}{4/3}$$=$$\dfrac{3\times 3}{4 \times 2}$$= $$\dfrac{9}{8}$$
Question 5
1 / -0

For a prism, $$A = 60^o$$, $$\mu = \sqrt{\dfrac{7}{3}}$$, then the minimum possible angle of incidence, so that the light ray is refracted from the second surface is

A
$$30^o$$

B
$$60^o$$

C
$$90^o$$

D
$$40^o$$

Solution
Question 6
1 / -0

A spot is placed on the bottom of a slab made of transparent material of refractive index 1.5. The spot is viewed vertically from the top when it seems to be raised by 2 cm. Then the height of the slab is

A
10 cm

B
8 cm

C
6 cm

D
4 cm

Solution
Question 7
1 / -0

Monochromatic light is refracted from air into the glass of refractive index $$ \mu $$. The ratio of the wavelength of incident and refracted waves is

A
1:$$ \mu $$

B
1:$$ \mu $$$$ ^{2} $$

C
$$ \mu $$ :1

D
1:1

Solution
Question 8
1 / -0

An equal convex lens of $$\upsilon =1.5 $$ has a focal length of 20 cm in air. Now that lens kept in the medium of refractive index 3. An object is kept at distance 30 cm from the lens in the same medium. Find its image distance from the lens is :

A
24 cm

B
12 cm

C
10 cm

D
None

Solution

correct option is B.
Question 9
1 / -0

A ray incident at an angle $$53^{\circ}C$$ on prism emerges at an angle $$37^{\circ}C$$ as shown in the figure. If the angle of incidence is made $$50^{\circ}C$$ , which of the following is a possible value of angle of emergence

A
$$35^{\circ}C$$

B
$$42^{\circ}C$$

C
$$40^{\circ}C$$

D
none

Solution
Question 10
1 / -0

A ray incident at an angle $$53^{\circ}$$ on prism emerges at an angle $$37^{\circ}$$ as shown in the figure. If the angle of incidence is made $$50^{\circ}$$ , which of the following is a possible value of angle of emergence

A
$$35^{\circ}$$

B
$$42^{\circ}$$

C
$$40^{\circ}$$

D
$$38^{\circ}$$