In case of refraction through a glass slab, if i is very small, the lateral shift is (t is thickness, u is the refractive index)

1. $t\left(1+\frac{1}{\mu }\right)i$

2. $t\left(1-\frac{1}{\mu }\right)i$

3. $t\left(2+\frac{1}{\mu }\right)i$

4. $t\left(2-\frac{1}{\mu }\right)i$

The angle of a distant object formed at the objective of a telescope is 2 minutes. If the focal length of objective and eyepiece of the telescope is 200 cm and 20 cm, then the size of the image formed by the objective is approximately

1.  20 cm

2.  0.12 cm

3.  0.4 cm

4.  12 cm

The focal length of a convex lens is 40 cm and the size of the inverted image formed is half of the object. The distance of the object is:

The condition of minimum deviation is achieved in an equilateral prism kept on the prism table of a spectrometer. If the angle of incidence is \(50^{\circ}\), the angle of deviation is:
1. \(25^{\circ}\)$$

2. \(40^{\circ}\)$$

3. \(50^{\circ}\)$$

4. \(60^{\circ}\)$$

A small air bubble is at the centre of a glass sphere of radius 10 cm and refractive index 1.5. The distance of the bubble from the surface, when viewed from outside the sphere, is

(1) 2.5 cm

(2) 5 cm

(3) 7.5 cm

(4) 10 cm

Focal lengths of objective and eyepiece of a compound microscope are 2 cm and 6.25 cm respectively. An object AB is placed at a distance of 2.5 cm from the objective which forms the image A'B' as shown in the figure. Maximum magnifying power in this case is

1.  10

2.  20

3.  5

4.  25

The refractive index of the material of prism is $\sqrt{2}$. The angle of prism A is equal to

(1) 30$°$

(2) 40$°$

(3) 60$°$

(4) 90$°$

An object is placed 20 cm in front of a concave mirror of a radius of curvature 10 cm. The position of the image from the pole of the mirror is:

1. 7.67 cm

2. 6.67 cm

3. 8.67 cm

4. 9.67 cm

A plane mirror is moving with velocity $4\hat{i}+5\hat{j}+8\hat{k}$. A point object in front of the mirror moves with a velocity  $3\widehat{i }+4\hat{j}+5\hat{k},$ here $\hat{k}$ is along the normal to the plane mirror and facing towards the object. The velocity of the image is

1. $-3\hat{i}-4\hat{j}+5\hat{k}$

2. $7\hat{i}+9\hat{j}+11\hat{k}$

3. $3\hat{i}+4\hat{j}+11\hat{k}$

4. $-3\hat{i}-4\hat{j}+11\hat{k}$

A candle is held \(3\) cm away from a concave mirror of focal length \(12\) cm, then the nature of the image formed by the mirror is:
1. real, inverted
2. virtual, erect
3. real, erected 
4. virtual, inverted