Question

draw ray diagrams to show how specially designed prisms make use of total internal reflection to obtain inverted image of the object by deviation of rays through (i) 90 degree (ii) 180 degree

Answer 1

Hope it helps...

The ray diagram is attached.

Answer 2

THE RAY DIAGRAMS SHOWING TIRF TO OBTAIN INVERTED IMAGE THROUGH 90° AND 180° IS SHOWN IN THE DIAGRAM BELOW.

Explanation:

• The total internal reflection means that when the incident angle is larger than critical angle, reflection takes place instead of refraction.
• In TIRF light gets reflected in the denser medium (in prism its glass).
• In prism TIRF takes place. Right angled prism is taken for this.
• To obtain an inverted image through deviation of 90°, the light rays enter the prism and makes 45° incident angle which is greater than the critical angle of the prism i.e., 42°. It gets reflected at 90° .
• When the light enters through the larger side of prism, the light gets reflected two times giving an angle of reflection 180° .
• The diagrams the shown below: