Light Test

Result

Light Test - 45

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Weekly Quiz Competition

Question 1
1 / -0

Which diagram correctly shows a ray of light reflected by a plane mirror?

A

B

C

D

Solution

The diagram in option (D) represents correct phenomena of reflection.
We can easily figure out that $$\angle i= \angle r = 40^o$$
Question 2
1 / -0

Mark correct option.

A
The laws of reflection of light hold only for plane surfaces

B
The size of virtual image can be measured by receiving it on screen

C
Plane mirror alongs form an erect image

D
Plane mirror may form inverted image
Solution
Let solve it by each option
Law of reflection of light holds good for all the mirrors irrespective of their shape and size, hence option A is false
A virtual image cannot be caught on screen so we cannot measure the size, it is also a false statement
The plane mirror always forms a virtual image, hence it's a false statement
Light rays which come from the object get reflected from the plane mirror and reach to the human eye, at this point human feel that reflected ray is coming from the mirror. This is the reason why the object looks laterally inverted
Hence option D is the right answer
Question 3
1 / -0

If two mirrors are inclined at some angle and an object is placed between the mirrors and there are $$7$$ images formed for an object. Then what is angle between the mirrors?

A
$$45^o$$

B
$$50^o$$

C
$$60^o$$

D
$$64^o$$

Solution
Question 4
1 / -0

A source of light lies on the angle bisector of two plane mirrors inclined at an angle $$\theta$$. The value of $$\theta$$, so that the light reflected from one mirror does not reach the other mirror will be:

A
$$\theta > 120^o$$

B
$$\theta > 90^o$$

C
$$\theta \leq 120^o$$

D
None of these

Solution
Question 5
1 / -0

In a barber's shop , two plane mirrors are placed

A
Perpendicular to each other

B
Parallel to each other

C
At an angle of $$ 60^{\circ} $$ between them

D
At an angle of $$ 45^{\circ} $$ between them

Solution

In order to see the hair at the black of the head, the two plane mirrors are placed parallel at the front and at the back of the viewer.
Question 6
1 / -0

Retina of eye acts like ______ of camera.

A
Shutter

B
Film

C
Lens

D
None of these

Solution

The retina of the eye acts like a film of a camera. The eye lens forms an inverted real image of the object on the retina. The retina is a delicate membrane with having an enormous number of light-sensitive cells. The light-sensitive cells get activated upon illumination and generate electrical signals. These signals are sent to the brain via the optic nerves. The brain interprets these signals, and finally, processes the information so that we perceive objects as they are.
Question 7
1 / -0

In cataract, the lens of the eye becomes

A
Clear

B
small

C
Large

D
opaque

Solution

The crystalline lens of people at old age becomes milky and cloudy. This condition is called a cataract. This causes a partial or complete loss of vision. It is possible to restore vision through cataract surgery.
Question 8
1 / -0

Which is not a part of a human eye ?

A
Ratina

B
Cornea

C
Pupil

D
Mid plane

Solution
Question 9
1 / -0

Which one of the following is a living luminous object ?

A
Sun

B
Moon

C
Fire fly

D
burning candle

Solution

A fire fly is a living luminous object.
Question 10
1 / -0

Which one of the following is not a luminous objects ?

A
Lit candle

B
Sun

C
Star

D
Moon

Solution

The moon is not an example of a luminous object as it does not have its own light. It takes the light from the sun.
Luminous objects are objects that generate their own light. Illuminated objects are objects that are capable of reflecting light to our eyes. The sun is an example of a luminous object, while the moon is an illuminated object.