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Physics Ray Optics and Optical Instruments

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New answer posted

10 months ago

Physics Ray Optics and Optical Instruments Class 12th

A fish from inside water sees a bird in air at a distance
0 Follower 9 Views

A
alok kumar singh

Contributor-Level 10

Distance of bird as seen by fish = d + µh

 

New answer posted

10 months 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 9 Views

A
alok kumar singh

Contributor-Level 10

Kindly go through the solution

 

New answer posted

10 months 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 25 Views

A
alok kumar singh

Contributor-Level 10

Kindly go through the solution 

 

New answer posted

10 months 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 3 Views

A
alok kumar singh

Contributor-Level 10

Kindly go through the solution

 

New answer posted

10 months 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

10 months 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

10 months 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

10 months 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

10 months ago

Physics Ray Optics and Optical Instruments Class 12th

Choose the correct statement.
0 Follower 2 Views

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

10 months 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 4 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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