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Solution for Class 11, Physics, Optics

Question 1

EXAMPLE 1:3. If the radius of the earth shrinks by

2.0%

, mass, remairiting constant, then how would the value of acceleration due to gravity change?

Topic:

Optics

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Question 2

Photoelectric effect experiments are performed using three different metal plates

p, q

and

r

having work functions

p h i_{p} = 2.0 eV, p h i_{q} = 2.5 eV

and

p hi, = 3.0 eV

, respectively. A light beam containing wavelengths of

550 nm, 450 nm

and

350 nm

with equal intensities illuminates each of the plates. The correct

1 - V

graph for the experiment is |Take

h c = 1240 eV nm

]

Topic:

Optics

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Question 3

Solve Numerical examplibs A monochromatic ray of light strike the water

(n = 4/3)

surface in a cylindrical vessel at angle of incidence

5 3^{\circ}

. Depth of water is

36 cm

. After striking the water surface, how long will the light take to reach the bottom of the vessel? [Angles of the most popular Pythagorean triangle of sides in the ratio

3 : 4 : 5

are nearly

3 7^{0}

5 3^{\circ}

and

9 0^{\circ}

]

Topic:

Optics

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Question 4

Answer the following questions in detail.

Describe the administration of Pataliputra.
Why was Kalinga war a turning point in Ashokas life?
How didMegasthenes describe Chandraguptas court?
What were the main principles of Ashokas dhamma?
What did Ashoka do to spread his dhamma?

Topic:

Optics

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Question 5

41. A biconvex thick lens is constructed with glass

(m u = 1.50)

. Each of the surfaces has a radius of

10 cm

and the thickness at the middle is

5 cm

. Locate the image of an object placed far away from the lens.

Topic:

Optics

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Question 6

Derive an expression for binding energy of Satellite revolving around the earth at a height

h

above the Surface.

Topic:

Optics

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Question 7

A ball A is projected from the ground such that its horizontal range is maximum. Another ball B is dropped from a height equal to half of the maximum range of A. The ratio of the time of flight of A to the time of fall of B is

$2 : 1$
$1 : 2$
$1 : 1$
$1 : 2$

Topic:

Optics

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Question 8

14) A observer can see through a pin hole, the top of a thin rod of height

h

, placed as shown in Fig.

1.174

. The beakers 2 height is

3 h

and its radius is

h

. When the beaker is filled with a liquid upto a height

2 h

, he can seé the lower end of the rod. Find the refractive index find the refractive index of the liquid.

Topic:

Optics

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Question 9

then mark (3). I If both Assertion and Reason are false statements, then mark (4). 35. The angle between the vector

2 \hat{i} + 3 \hat{j}

and the

y

-axis is

$an - 1 l e f t (\frac{3}{2} i g h t)$
$an - 1 l e f t (\frac{2}{3} i g h t)$
$sin - 1 l e f t (\frac{2}{3} i g h t)$
$cos - 1 l e f t (\frac{2}{3} i g h t)$

Topic:

Optics

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Question 10

24. A cylindrical vessel, whose diameter and height both are equal to

30 cm

, is placed on a horizontal surface and a small particle

P

is placed in it at a distance of

5.0 cm

from the centre. An eye is placed at a position such that the edge of the bottom is just visible (see figure 18-E8). The particle

P

is in the plane of drawing. Up to what minimum height should water be poured in the vessel to make the particle

P

visible? Figure 18-E8

Topic:

Optics

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Question 11

The convex surface of a thin concavo-convex lens of glass of refractive index

1.5

has a radius of curvature

20 cm

. The concave surface has a radius of curvature

60 cm

. The convex side is silvered and placed on a horizontal surface as shown in figure (18-E13). (a) Where should a pin be placed on the axis so that its image is formed at the same place? (b) If the concave part is filled with water

(m u = 4/3)

, find the distance through which the pin should be moved so that the image of the pin again coincides with the pin.

Topic:

Optics

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Question 12

A real image is formed by a convex mirror when the object is placed at

infinite
between center of curvature and focus
between focus and pole

Topic:

Optics

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Question 13

none of the above 35. A virtual image is formed by a concave

center of curvature and focus

Topic:

Optics

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Question 14

The diagram alongside shows a concave mirror forming an image

all of the above

Topic:

Optics

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Question 15

In the figure in previous question, the white screen is at the

centre of curvature of the concave mirror
principal focus of the concave mirror
pole of the concave mirror
none of these

Topic:

Optics

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Question 16

Two vertical plane mirrors are placed inclined at an angle

θ

with each other. When an object is placed between them, seven image are seen, find

θ

$2 5^{\circ}$
$4 5^{\circ}$
$7 5^{\circ}$
$9 5^{\circ}$

Topic:

Optics

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Question 17

Observe the above diagram and answer the following.

What is the name of the lens?
Where the object is placed?
Where the image is formed and its charecteristics.
What is the distance between D and O? Consider focal length as ?

Topic:

Optics

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Question 18

Observe the above diagram and answer the following.

What is the name of the lens?
Where the object is placed?
Where the image is formed and its charecteristics.
What is the distance between $D$ and $O$ ? Consider focal length as $f$ ?

Topic:

Optics

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Question 19

The power of spectacles lens required for a person is

- 5

dioptre when separation between spectacles and eye is

2 cm

. What will be the power of contact lens required by him?

$- 5.25 D$
$- 4.54 D$
$- 3.2 D$
$- 5.75 D$

Topic:

Optics

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Question 20

In a compound microscope focal length of objective and eyepiece lens is

4 cm

and

8 cm

respectively. If length of tube is

30 cm

then magnifying power for normal adjustment will be:-

$20.3$
$14.06$
$23.43$
$15.3$

Topic:

Optics

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Solution for Class 11, Physics, Optics

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