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Physics Ray Optics and Optical Instruments

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New answer posted

2 weeks ago

Physics Ray Optics and Optical Instruments Class 12th

A fish from inside water sees a bird in air at a distance
0 Follower 2 Views

A
alok kumar singh

Contributor-Level 10

Distance of bird as seen by fish = d + µh

 

New answer posted

2 weeks ago

Physics Ray Optics and Optical Instruments Class 12th

A ray of light strikes a silvered surface as shown inclined to another one. Then the net deviation of the reflected rays will be

 
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

Kindly go through the solution

 

New answer posted

2 weeks ago

Physics Ray Optics and Optical Instruments Class 12th

Assertion (A) - When constant current is passing through a conductor of variable area of cross section, electric field inside conductor is inversely proportional to cross sectional area.

 

 
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

Kindly go through the solution 

 

New answer posted

2 weeks ago

Physics Ray Optics and Optical Instruments Class 12th

The current gain for a common emitter transister is 69. If the emitter current is 7 mA then base current will be
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

Kindly go through the solution

 

New answer posted

2 weeks ago

Physics Ray Optics and Optical Instruments Class 12th

If refractive index of red, violet and yellow lights are 1.42, 1.62 and 1.50 respectively for a medium, its dispersive power will be :-
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

Kindly go through the solution

 

New answer posted

2 weeks ago

Physics Ray Optics and Optical Instruments Class 12th

Kindly consider the following

 
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

U = 1 ε0E2

2

E = 1 * 8.85 * 10−12 * (10 * 10−3)2

= 4.425 * 10–16

New answer posted

3 weeks ago

Physics Ray Optics and Optical Instruments Class 12th

Rainbow is formed due to
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

Rainbow is formed due to internal reflection and dispersion.

New answer posted

3 weeks ago

Physics Ray Optics and Optical Instruments Class 12th

A defective eye cannot see close objects clearly because their image is formed
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

In hypermetropia image formed by eye lens is beyond retina and is focussed to retina by a convex lens.

New answer posted

3 weeks ago

Physics Ray Optics and Optical Instruments Class 12th

Choose the correct statement.
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

Heat is path dependent so path function but internal energy does not depend on path chosen.

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New answer posted

4 weeks ago

Physics Ray Optics and Optical Instruments Class 12th

In a convex mirror having radius of curvature 30 cm the height of image is half the object height. What will be the object (in cm) distance?
0 Follower 2 Views

A
alok kumar singh

Contributor-Level 10

f = 15

m = − v u = + 1 2            

  v = − u 2           

1 v + 1 u = 1 f            

2 − u + 1 u = 1 f            

u = – f = – 15cm

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