A room (cubical) is made of mirrors. An insect is moving along the diagonal on the floor

such that the velocity of image of insect on two adjacent wall mirrors is 10 cms-1. The

velocity of image of insect in ceiling mirror is

1. 10 cms-1                           

2. 20 cms-1

3. 102cms-1                          

4. 102cms-1

Subtopic:  Reflection at Plane Surface |
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Figure shows a cubical room ABCD with the wall CD as a plane mirror. Each side of the

room is 3m. We place a camera at the midpoint of the wall AB. At what distance should

the camera be focussed to photograph an object placed at A

                    


1. 1.5 m                                     

2. 3 m

3. 6 m                                         

4. More than 6 m

Subtopic:  Reflection at Plane Surface |
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If an object moves towards a plane mirror with a speed v at an angle θ to the

perpendicular to the plane of the mirror, find the relative velocity between the object and

the image

                

1. v                                           

2. 2v

3. 2v cos θ                                    

4. 2v sin θ

Subtopic:  Reflection at Plane Surface |
 80%
From NCERT
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To an astronaut in a spaceship, the sky appears:

(1) Black                   

(2) White

(3) Green                 

(4) Blue

Subtopic:  Human Eye |
 77%
From NCERT
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A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle θ, the spot of light is found to move through a distance y on the scale. The angle θ is given by 

(1) y2x

(2) yx

(3) x2y

(4) xy

Subtopic:  Reflection at Plane Surface |
 57%
NEET - 2017
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Two identical glass μg=3/2 equi-convex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water μw=4/3. The focal length of the combination is

(a)  f/3             (b) f

(c) 4f3               (d) 3f4

Subtopic:  Lenses |
 56%
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NEET - 2016
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An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and  3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is

(1) 8           

(2) 10

(3) 12         

(4) 16

Subtopic:  Refraction at Plane Surface |
 70%
From NCERT
NEET - 2016
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An astronomical telescope has an objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance of :
(1) 46.0 cm

(2) 50.0 cm  

(3) 54.0 cm

(4) 37.3 cm 

Subtopic:  Telescope |
 61%
From NCERT
NEET - 2016
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Match the corresponding entries of Column 1 with Column 2. [Where m is the magnification produced by the mirror]

Column 1                         Column 2 
A. m=-2                     a. Convex mirror   
B. m=-1/2                  b. Concave mirror
C. m=+2                    c. Real image
D. m=+1/2                 d. Virtual Image

(1)A->a and c;B->a and d; C->a and b; D->c and d

(2)A->a and d; B->b and c; C->b and d; D-> b and c

(3)A->c and d; B->b and d;C->b and c;D->a and d

(4)A->b and c; B->b and c; C->b and d; D->a and d

Subtopic:  Reflection at Spherical Surface |
 61%
From NCERT
NEET - 2016
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The angle of incidence for a ray of light at a refracting surface of a prism is 45°. The angle of prism is 60°. If the ray suffers minimum deviation through the prism, the angle of deviation and refracting index of the material of the prism respectively are

(a)30°,2

(b)45°,2

(c)30°,12

(d)45°,12

Subtopic:  Prisms |
 72%
From NCERT
NEET - 2016
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