A light beam containing red, yellow and blue color, falls on the interface of glass air as shown. If the yellow light is just totally internally reflected, then emergent ray in air contains-

                                              

1.  Both red and blue color

2.  Only red color

3.  Only blue color

4.  No color

Concept Questions :-

Total internal reflection
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Focal lengths of objective and eyepiece of a compound microscope are 2 cm and 6.25 cm respectively. An object AB is placed at a distance of 2.5 cm from the objective which forms the image B'A' as shown in the figure. Maximum magnifying power in this case is :

                                              

1.  10

2.  20

3.  5

4.  25

Concept Questions :-

Simple and compound microscope
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Two identical equiconvex thin lenses each of focal lengths 20 cm, made of material of refractive index 1.5 are placed coaxially in contact as shown. Now, the space between them is filled with a liquid of refractive index 1.5. The equivalent power of this arrangement will be:

                                                               

1.  + 5D

2.  Zero

3.  + 2.5D

4.  + 0.5D

Concept Questions :-

Lensmakers' formula
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The length of an astronomical telescope adjusted for parallel light is 90 cm. If the magnifying power of the telescope is 17, then the focal length of eyepiece and objective are respectively

1.  10 cm and 80 cm

2.  85 cm and 5 cm

3.  70 cm and 20 cm

4.  5 cm and 85 cm

Concept Questions :-

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If the wavelength of light used is halved and the numerical aperture of the compound microscope is doubled, then its resolving power will

1. Remain unchanged

2. Doubled

3. Halved

4. Quadrupled

Concept Questions :-

Resolution of Optical devices
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In the situation shown, the incident monochromatic ray retraces its path after its incidence on the silvered surface. The speed of light inside the prism will be

                                        

1.  3 x 108 ms-1  

2.  2 x 108 ms-1  

3.  1.41 x 108 ms-1  

4.  1.73 x 108 ms-1

Concept Questions :-

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The sum (diameter D) subtends an angle θ radian at the pole of a concave mirror of focal length f. The diameter of the image of the sun formed by the mirror is:

1.   

2.  2  

3.  2D 

4.  

 

Concept Questions :-

Reflection at spherical surface
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When a ray is refracted from one medium to another, the wavelength changes from 6000A0 to 4000A0. The critical  angle for the interface will be:

1.  cos-1 23  

2.  sin-123 

3.  sin-123 

4.  cos-123

 

Concept Questions :-

Refraction at plane surface
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The critical angle for prism is 36°. The maximum angle of prism for which the emergent ray is possible is:

1.  18° 

2.  36°  

3.  72°  

4.  144°

 

Concept Questions :-

Total internal reflection
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The focal length of the plano-convex lens is 20 cm. If its plane surface is silvered, then

1.  it behaves as a concave mirror of focal length 10 cm

2.  it behaves as a convex mirror of  focal length of 10 cm

3.  it behaves as a concave mirror of focal length 20 cm

4.  none of these

 

Concept Questions :-

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