Light Reflection and Refraction Test

Result

Light Reflection and Refraction Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Where should an object be placed in front of the convex lens so as to obtain the image formed on slide projector?

A
Between F₁ and 2 F₁

B
At 2 F₁

C
Beyond F₁

D
At F₁

Solution

An object should be placed between F₁ and 2 F₁ so as to obtain the image formation used in a slide projector. This is because the image has to be enlarged and has to form at a little larger distance from the projector.
Question 2
1 / -0

The magnification of a convex mirror is always:

A
Equal to 1

B
Infinity

C
Less than 1

D
More than 1

Solution

The image formed by a convex mirror is always smaller in size than the object; hence its magnification is less than 1.
Question 3
1 / -0

Kerosene floats on water that means it is lighter than water, but

A
kerosene is optically rarer than water.

B
kerosene is optically denser than water.

C
both are optically rarer.

D
both are optically denser.

Solution

Kerosene is lighter than water (i.e. it floats on water), but it has higher refractive index than water. Hence, it is optically denser than water.
Question 4
1 / -0

Which mirror is used to concentrate the light on a given spot?

A
Concave mirror

B
Convex mirror

C
Plane mirror

D
All of the above mirrors

Solution

Concave mirror has a property to converge the rays of light at a point.
Question 5
1 / -0

Which of the following is true for reflection by spherical mirrors?

A
Reflection by spherical mirrors follows both the laws of reflection.

B
Reflection by spherical mirrors follows only the first law of reflection.

C
Reflection by spherical mirrors follows only the second law of reflection.

D
Reflection by spherical mirrors does not obey the laws of reflection.

Solution

Reflection by spherical mirrors follows both the laws of reflection.
Question 6
1 / -0

What should be the position of an object kept in front of a concave mirror, in order to get a real and enlarged image?

A
At the principal focus

B
At the centre of curvature

C
Between the principle focus and the centre of curvature

D
Between the pole and the principle focus

Solution

When an object is placed between the focus and centre of curvature of a concave mirror, the image formed is real and enlarged.
Question 7
1 / -0

If the speed of light in medium 1 and medium 2 are 2.5 x 10⁸ m/s and 2 x 10⁸ m/s respectively then the refractive index of medium 1 with respect to medium 2 is ____________.

A
2.5/3

B
2.5 / 2

C
3 / 2.5

D
2/ 2.5

Solution

Using the formula, n₁₂ = speed of light in medium 2/ speed of light in medium 1

n₁₂ = 2/2.5
Question 8
1 / -0

An object is placed at a far distance from a concave lens. Which of the following are the characteristics of the image formed by it?

A
Real, inverted and magnified

B
Real, erect and diminished

C
Virtual, inverted and highly diminished

D
Virtual, erect and diminished

Solution

When an object is placed at a far distance from a concave lens, the image formed is virtual, erect and diminished in nature.
Question 9
1 / -0

The mirror formula is valid for

A
Concave mirror only

B
Convex mirror only

C
Plane mirror only

D
All spherical mirrors

Solution

The mirror formula is valid for all spherical mirrors for all positions of the object.

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Light Reflection and Refraction Test - 5

Result

Light Reflection and Refraction Test - 5

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SHARING IS CARING

Question 1

Between F1 and 2 F1

At 2 F1

Beyond F1

At F1

Solution

Question 2

Equal to 1

Infinity

Less than 1

More than 1

Solution

Question 3

kerosene is optically rarer than water.

kerosene is optically denser than water.

both are optically rarer.

both are optically denser.

Solution

Question 4

Concave mirror

Convex mirror

Plane mirror

All of the above mirrors

Solution

Question 5

Reflection by spherical mirrors follows both the laws of reflection.

Reflection by spherical mirrors follows only the first law of reflection.

Reflection by spherical mirrors follows only the second law of reflection.

Reflection by spherical mirrors does not obey the laws of reflection.

Solution

Question 6

At the principal focus

At the centre of curvature

Between the principle focus and the centre of curvature

Between the pole and the principle focus

Solution

Question 7

2.5/3

2.5 / 2

3 / 2.5

2/ 2.5

Solution

Question 8

Real, inverted and magnified

Real, erect and diminished

Virtual, inverted and highly diminished

Virtual, erect and diminished

Solution

Question 9

Concave mirror only

Convex mirror only

Plane mirror only

All spherical mirrors

Solution

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Between F₁ and 2 F₁

At 2 F₁

Beyond F₁

At F₁