A point object \(O\) is placed at a distance \(20\) cm from a biconvex lens of the radius of curvature \(20\) cm and \(\mu=1.5.\) The final image produced by lens and mirror combination will be at:
1. | \(10\) cm from the mirror |
2. | \(20\) cm from the lens |
3. | \(-20\) cm from the lens |
4. | \(-15\) cm from the mirror |
In the case of a compound microscope, the image formed by the objective lens is:
1. | Virtual, erect, and diminished. |
2. | Real, erect, and magnified. |
3. | Virtual, inverted, and enlarged. |
4. | Real, inverted, and enlarged. |
In the following diagram, what is the distance \(x\) if the radius of curvature is \(R= 15\) cm?
1. | \(30\) cm | 2. | \(20\) cm |
3. | \(15\) cm | 4. | \(10\) cm |
In the diagram shown below, the image of the point object \(O\) is formed at \(l\) by the convex lens of focal length \(20\) cm, where \(F_1\) and \(F_2\) are foci of the lens. The value of \(x'\) is:
1. | \(10\) cm | 2. | \(20\) cm |
3. | \(30\) cm | 4. | \(40\) cm |
A glass slab is placed with the right-angled prism as shown in the figure. The possible value of \(\theta\) such that light incident normally on the prism does not pass through the glass slab is:
1. | \(30^\circ\) | 2. | \(37^\circ\) |
3. | \(45^\circ\) | 4. | Both (1) & (2) |
A graph is plotted between the angle of deviation \(\delta\) in a triangular prism and the angle of incidence as shown in the figure. Refracting angle of the prism is:
1. | \(28^\circ~\) | 2. | \(48^\circ~\) |
3. | \(36^\circ~\) | 4. | \(46^\circ~\) |
Three identical thin convex lenses are kept as shown in the figure. A ray passing through the lens is shown. The focal length of each lens is:
1. | \(5\) cm | 2. | \(10\) cm |
3. | \(15\) cm | 4. | \(20\) cm |
1. \(2\)
2. \(1.5\)
3. \(1.75\)
4. \(1.3\)
An astronomical telescope has angular magnification of \(20\) in its normal adjustment. Focal length of eyepiece is \(4\) cm. Distance between objective and eyepiece is:
1. | \(80\) cm | 2. | \(84\) cm |
3. | \(76\) cm | 4. | \(90\) cm |