Test Details

Ray Optics and Optical Instruments

Jan 16, 10:00 AM

90 minutes

Jan 16, 11:30 AM

40.0 marks

MCQ

40 questions

times Academy

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Class Details

Maths

Physics

Chemistry

Class 12th

Maths

Physics

Chemistry

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Question Text

Question 1 :
The focal length of a convex mirror is given as $2$ cm. Find the radius of curvature,$R$, of the mirror?

Question 2 :
From a distance much greater than 2R (R = Radius of curvature), a real object is brought close to a convex mirror. Distance between object and the image

Question 3 :
W<SPAN class=wysiwyg-font-size-medium><SPAN>hat is the phenomenon of light coming back after hitting a smooth plane surface called?</SPAN></SPAN>

Question 5 :
The sum of the reciprocals of object distance and image distance is equal to the __________ of a mirror.

Question 7 :
The focal length of a concave mirror is $10 \ cm$. Find its radius of curvature.

Question 9 :
If we say that the focal length of a spherical mirror is $n$ times its radius of curvature, then $n$ must be

Question 10 :
A spherical mirror has radius of curvature equal to $50 cm$. Find the value of focal length.

Question 11 :
A ray of light is incident on a plane mirror and the angle of incident is $25^o$. What is the angle of reflection?

Question 12 :
The radius of curvature of a mirror is $ 20 \mathrm{cm} $ the focal length is

Question 13 :
A perpendicular drawn at the point of incidence of a light ray on the surface of a mirror is called -

Question 14 :
<span>A narrow beam of light that is moving in a defined direction is:</span><br/>

Question 15 :
A concave mirror is made by cutting a portion of a hollow glass sphere of radius $24$ cm. Find the focal length of the mirror.

Question 17 :
<span>The angle between the incident ray and the reflecting surface is known as:</span>

Question 19 :
A man 1.8 m tall wishes to see full-length image in a plane mirror. The length of the shortest mirror in which he can see his entire image is: <div>(Assume that the mirror is hanged vertically on a wall in front of the man).<br/></div>

Question 22 :
<div><span>The ray which bounces off the surface of the mirror when the incident ray strikes the mirror is known as ________. </span><span>The point at which incident ray meets the mirror is called the _________.</span><br/></div>

Question 23 :
The light ray which comes out from the surface after reflection is called:

Question 24 :
If the focal length of a convex mirror is 16 cm, what is its radius of curvature?

Question 25 :
The focal length of convex mirror is $20$cm, its radius of curvature will be:

Question 26 :
The radius of curvature of a convex mirror is $40cm$. Find its focal length.

Question 27 :
The focal length of a spherical mirror is ____ its radius of curvature.

Question 28 :
The focal length of a convex mirror is ________ its radius of curvature.

Question 29 :
If the mirror has a focal length of $+15$ cm, it is a

Question 32 :
A ray of light which bounces off the surface of mirror is called :

Question 33 :
The phenomenon of light coming back after hitting a smooth plane surface is called :

Question 34 :
Focal length of a spherical mirror is $200 cm$. What will be its radius of curvature?

Question 35 :
Angle which the normal ray makes with the mirror is equal to:

Question 36 :
If a mirror has a focal length of -$20\;cm$, it is a :

Question 38 :
The height of the image formed by an object of height $10 cm$ placed in front of a plane mirror is ________.

Question 39 :
Which of the following is the main reason of Opacity of light waves.<br/>

Question 40 :
The angle of incidence in a plane mirror is _________ angle of reflection.

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