Light Test

Result

Light Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

The silvering on the back surface of a mirror can be done by

A
Silver

B
Mercury

C
None

D
All kind of shiny materials

Solution

A plane mirror is made from a few mm thick glass plate.one surface of glass plate is polished to a high degree of smoothness which forms the front part of the mirror and the other(back)surface is silvered(I.e painted with silver,mercury or some other material.)
Question 2
1 / -0

Magnifying glass forms

A
Real Image

B
Virtual Image

C
Both A and B

D
Neither A nor B

Solution

A magnifying lens is simply a convex lens and forms a magnified erect virtual image of objects.
Question 3
1 / -0

Choose the correct option

A
A: Virtual Image

B: Real Image

B
A: Real Image

B: Virtual Image

C
A: Real Image

B: Real Image

D
A: Virtual Image

B: Virtual Image

Solution

As shown in figure A, a virtual image is formed because refracted rays only appear to meet at the image.
As shown in figure B, a real image is formed because refracted rays actually meet at the image.
Question 4
1 / -0

$$A =$$?
$$B =$$?

A
$$A = 2m, B = 7m$$

B
$$A = 7m, B = 5m$$

C
$$A = 3m, B = 6m$$

D
$$A = 2m, B = 5m$$

Solution

Since in a plane mirror, distance between object and mirror is same as distance between image and mirror.
Hence A=2 m
A+B=7m
So B=5 m
Question 5
1 / -0

Choose the correct form of the image:

A

B

C
None of these.

D

Solution

Image formed by a plane mirror is upright (or erect), virtual and of same size as the object.
Hence option (A) is correct
Question 6
1 / -0

Newton's colour disc was invented by whom?

A
Albert Einstein

B
Sir Isaac Newton

C
Sir Isaac Newton and Faraday

D
Sir Isaac Newton and John Kennedy

Solution

Newton's colour disc was invented by Sir Issac Newton.The disc is seven segments in rainbow colours and When the disc is rotated, the colours fade to white.

Hence, the correct answer is OPTION B.
Question 7
1 / -0

When is the real image formed?

A
when the rays of light after reflection or refraction actually go away from some point

B
when the rays of light after reflection or refraction actually meet at some point

C
when the sun rays after reflection or refraction actually meet at some point

D
when the rays of light after deflection actually meet at some point

Solution

Correct answer is (b).

Real image formed when the rays of light after reflection or refraction actually converge at some point and when objects are placed outside the focal length of a converging lens or outside the focal length of a converging mirror.
Question 8
1 / -0

A plane mirror produces a magnification of:

A
Zero

B
$$-1$$

C
$$+1$$

D
Between $$0$$ and $$+1$$

Solution

The distance of the object from the mirror is always equal to the distance of the image from the mirror.
Let day distance of object from mirror is $$u=-d$$
Then distance of image from object is $$v=d$$
Magnification $$m=-\dfrac{v}{u}=1$$
Question 9
1 / -0

What kind of image is obtained always for concave lens?

A
Virtual, Erect and Diminished

B
Real, Erect and Large

C
Real, Erect and Diminished

D
All of these

Solution

As can be seen in image, Virtual, Erect and Diminished image is obtained always for concave lens
Question 10
1 / -0

Image formed by a plane mirror is :

A
Virtual, behind the mirror and enlarged

B
Virtual, behind the mirror and of the same size as the object

C
Real at the surface of the mirror and enlarged

D
Real, behind the mirror and of the same size as the object

Solution

The image formed by the plane mirror is virtual. Rays of light appear to be emerging from the virtual image and do not actually intersect. Image is formed behind the mirror. The image size is the same as that of the object.