Home
Class 12
PHYSICS
A rectangular block of glass ABCD has a ...

A rectangular block of glass `ABCD` has a refractive index `1.6`. A pin is placed midway on the face`AB`, Fig. When observed from the face `AD`, the pin shall.
.

A

appear to be near A.

B

appear to be near D.

C

appear to be at the centre of AD.

D

not be seen at all.

Text Solution

Verified by Experts

The correct Answer is:
A, D
Let us consider that the point O is the mid-point of the side AB and a pin is kept at O. This pin is viewed from the side AD and image formation is shown below:

If the angle of incidence at the face AD is less than critical angle, the pin will seem to appear at point O.. If the angle of incidence at the face AD is greater than the critical angle, the pin will not be viewed at all. This critical angle is given by
`sini_(c)=(1)/(mu)=(1)/(1.6)=0.625`
`rArr" "i_(c)=sin^(-1)(0.628)=38.7^(@)`
`therefore" "` For `i gt 38.7^(@)`, rays starting from O will undergo TIR and pin will not be viewed at all.
The possible correct choices are options (a) and (d).
Promotional Banner

Topper's Solved these Questions

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    MODERN PUBLICATION|Exercise NCERT (Exemplar Problems Subjective Questions) (Very Short Answer Type Questions)|11 Videos

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    MODERN PUBLICATION|Exercise Higher Order Thinking Skills & Advanced Level (QUESTIONS WITH ANSWERS)|20 Videos

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    MODERN PUBLICATION|Exercise NCERT (EXemplar Problems Obejective Questions) (Multiple Choice Questions (Type-I)|10 Videos

  • NUCLEI

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST FOR BOARD EXAMINATION|15 Videos

  • SEMICONDUCTOR ELECTRONICS METERIALS DEVICES AND SIMPLE CIRCUITS

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST FOR BOARD EXAMINATION|12 Videos

Similar Questions

Explore conceptually related problems

A postal stamp is placed on a surface and a glass cube of refractive index 3/2 is placed over it. When observed through the glass slab, the stamp appears at a height of 1 .5 cm from the bottom. Another glass cube made of different material nad having the same thickness is placed over the first glass cube. When observed from the top, the stamp now appears to be at a height of 4 cm from the bottom. Determine the refractive index of the second galss cube.

A ray of light enters the face AB of a glass prism of refractive index mu at an angle of incidence i . Find the value of i such that no ray emerges from the face AC of the prism, given angle of prism is A .

A ray of light the face AB of a glass prism of refractive index mu at an angle of incidence i . Find the value of i such that no ray emerges from the face AC of the prism. Given angle of prism is A .

A rectangular glass block of thickness 10 cm and refractive index 1.5 placed over a small coin. A beaker is filled with water of refractive index 4//3 to a height of 10 cm and is placed over the glass block. (a) Find the apparent position of the object when it is viewed at near normal incidence. (b) if the eye is slowly moves away from the normal at a certain position, the object is found to disappear, due to total internal reflection. At what surface does this happen and why ?

A rectangular block of glass is placed on a mark made on the surface of the table and it is viewed from the vertical position of eye. If refractive index of glass be mu and its thickness d, then the mark will appear to be raised up by

A glass prism has a refractive angle of 90^(@) and a refractive index of 1.5. A ray is incident at an angle of 30^(@) . The ray emerges from an adjacent face at an angle of

A ray of light travelling inside a rectangular glass block of refractive index sqrt(2) is incident on the glass–air surface at an angle of incidence of 45^(@) . The refractive index of air is 1. Under these conditions the ray