Ray Optics and Optical Instruments Physics - Ray Optics and Optical Instruments

Two unequal resistors are connected in series across a battery. Then the:

A biconvex lens of glass having refractive index 1.47 is immersed in a liquid. It becomes invisible and behaves as a plane glass plate. The refractive index of the liquid is:

The focal length of the objective of a compound microscope is:

For a glass prism, the angle of minimum deviation will be smallest for the light of:

The resistance of a metal wire increases with increasing temperature on account of:

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false and R is also false.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false and R is also false.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false and R is also false.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false and R is also false.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false and R is also false.

1. A ray of light incident on face AB of an equilateral glass prism, shows minimum deviation of 30°. Calculate the speed of light through the prism.

2. Find the angle of incidence at face AB so that the emergent ray grazes along the face AC.

1. A giant refracting telescope at an observatory has an objective lens of focal length 15 m. If an eyepiece of focal length 1.0 cm is used, what is the angular magnification of the telescope?
2. If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 × 10⁶ m, and the radius of lunar orbit is 3.8 × 10⁸ m.

1. deviate a pencil of white light without much dispersion.
2. disperse (and displace) a pencil of white light without much deviation.

1. A point-object is placed on the principal axis of a convex spherical surface of radius of curvature R, which separates the two media of refractive indices n ₁ and n ₂ (n ₂ > n ₁). Draw the ray diagram and deduce the relation between the distance of the object (u),distance of the image (v) and the radius of curvature (R) for refraction to take place at the convex spherical surface from rarer to denser medium.
2. Use the above relation to obtain the condition on the position of the object and the radius of curvature in terms of n₁ and n₂ when the real image is formed.

1. Complete the ray diagram showing the image formation of the object.
2. How will the position and intensity of the image be affected if the lower half of the mirror's reflecting surface is painted black?

1. A mobile phone lies along the principal axis of a concave mirror. Show, with the help of a suitable diagram, the formation of its image. Explain why magnification is not uniform.
2. Suppose the lower half of the concave mirror's reflecting surface is covered with an opaque material. What effect this will have on the image of the object? Explain.

1. What is the magnification produced by the lens? How much is the area of each square in the virtual image?
2. What is the angular magnification (magnifying power) of the lens?
3. Is the magnification in (a) equal to the magnifying power in (b)? Explain.