1. | \(f' = f\) |
2. | \(f'<f\) |
3. | \(f'>f\) |
4. | The information is insufficient to predict |
1. | smaller in size. |
2. | inverted. |
3. | between the focus and centre of curvature. |
4. | All of the above. |
1. | \(53^{\circ}\) | 2. | \(37^{\circ}\) |
3. | \(45^{\circ}\) | 4. | \(60^{\circ}\) |
1. | \(45\) cm | 2. | \(30\) cm |
3. | \(15\) cm | 4. | \(25\) cm |
1. | \(X+Y\) | 2. | \(\frac{X + Y}{2}\) |
3. | \(X-Y\) | 4. | \(\frac{X - Y}{2}\) |
A plane mirror is placed at the bottom of a fish tank filled with water of refractive index \(\frac{4}{3}.\) The fish is at a height \(10\) cm above the plane mirror. An observer \(O\) is vertically above the fish outside water. The apparent distance between the fish and its image is:
1. | \(15\) cm | 2. | \(30\) cm |
3. | \(35\) cm | 4. | \(45\) cm |
1. | a convergent with power \(P=\frac{1}{3 R}\) |
2. | a convergent with power \(P=\frac{1}{6 R}\) |
3. | a divergent with power \(P=\frac{1}{3 R}\) |
4. | a divergent with power \(P=\frac{1}{6 R}\) |
If there is no emergent light through a prism of refracting angle \(60^{\circ},\) whatever may be the angle of incidence, then the minimum value of the refractive index of the material of the prism is:
1. | \(2\) | 2. | \(\sqrt{2}\) |
3. | \(1.5\) | 4. | \(\sqrt{3}\) |
The minimum magnifying power of an astronomical telescope is \(40\). If the length of the telescope is \(205\) cm, then the focal length of its field lens is:
1. \(5\) cm
2. \(200\) cm
3. \(40\) cm
4. \(140\) cm