Angle of Incidence, Angle of image through Glass Slab experiments for std 8 to 12

To draw the path of a ray passing through a glass slab and, hence, to measure the angle of incidence and the angle of image.

AIM : To draw the path of a ray passing through a glass slab and, hence, to measure the angle of incidence and the angle of image.

PRINCIPLE :     When an oblique ray of light enters from one      transparent medium to another transparent medium,  at the surface separating these two media, the light  ray changes its path. This phenomenon is called  refraction of light. When a ray of light passes through  a glass-slab, it is refracted twice, as a result of which, the emergent ray becomes parallel to the incident ray.

APPARATUS :   Glass –slab, Drawing-board, Drawing paper (White),  Foot-rule, Pencil, Pins, Push pins and Protractor.

Paper fit with pins and set Glass Slab

Ø  Fix a white drawing-paper on the drawing board using push pins.  Now place the glass-slab on it and mark its position PQRS by drawing its out-line using a pencil.

Draw Ray AB not perpendicular to PQ

Ø  Now draw a ray AB such that it is not perpendicular to PQ. Fix two pins upright with separation of 2-3 cm on this ray.

See Image from another side and set P3 P4

Ø    Now try to see the images of P₁ and P₂ from side RS and fix pins P₃  and P₄ upright so that images of P₁ and P₂ and pins P₃ and P₄ become collinear at their lower ends.

Remove pins and Glass slab

Ø  Now remove the slab and the pins obtain emergent ray CD by drawing a line passing through marks of P₃ and P₄, which intersects RS at C.

Ø  Join  B and C to complete the path of the ray. Now draw a normal MN to the surface PQ in such a way that it passes through B. Also       draw M’N’, through C to the surface RS.

Measure Angle of Incidence and Angle of Emergence.

Ø  Measure ÐAMB (Angle of Incidence) and ÐOCN’ (Angle of Emergence).

By changing Angle of Incidence repeat the experiment

Ø  Repeat the experiment for various values of angle of incidence AMB and note your observations in the table.

Angle of Incidence Video

Angle of Incidence, Emergence, Refraction through glass slab.wmv

    

Practical for standard 12

Dear Friends
In Old Version in Physics Practical there is 19 Physics practical.
which all practical i am going to upload for quick understanding about practical.
I am making this blog for standard 12 which is under uploading more practical so be with me you will get practical presentation download free.

Practical of Bar magnet for standard 8 to 12

Bar Magnet

Take two bar magnets and mark their north and south poles as explained. Suspend one of the bar magnets using a thread. Bring the north pole of the second magnet near the north pole of the suspended magnet. Observe what happens. Now bring the South Pole of the second magnet near the south pole of the suspended magnet. Observe what happens. Now bring unlike poles of the two magnets close to each other and observe.  Repeat the experiment several times using magnetic needles, generalize your Observation

Bar Magnet Attract

Bar Magnet Repel

Remember 

Like poles of two magnets repel each other

 and

 unlike poles attract each other.

This is called the law of magnetic poles.