A person using a lens as a simple microscope sees an:
- AInverted virtual image
- BInverted real magnified image
- CUpright virtual image
- DUpright real magnified image
A person using a lens as a simple microscope sees an:
Explanation:
A simple microscope is just a convex lens with object lying between optical centre and focus of the lens.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
In the adjoining diagram, a wavefront AB, moving in air is incident on a plane glass surface XY. Its position CD after refraction through a glass slab is shown also along with the normals drawn at A and D. The refractive index of glass with respect to air (μ = 1) will be equal to
|
(a) |
(b) |
(c) |
(d) |
Whenever light travels from denser medium to a rarer medium:
At a place, if the earth's horizontal and vertical components of magnetic fields are equal, then the angle of dip will be
| (a) 30° | (b) 90° | (c) 45° | (d) 0° |
Assertion : Photoelectric effect demonstrates the wave nature of light.
Reason : The number of photoelectrons is proportional to the frequency of light.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
The resistivity of a wire
|
(a) Increases with the length of the wire |
|
(b) Decreases with the area of cross-section |
|
(c) Decreases with the length and increases with the cross-section of wire |
|
(d) None of the above statement is correct |
The mutual inductance of an induction coil is 5H. In the primary coil, the current reduces from 5A to zero in
. What is the induced emf in the secondary coil
|
(a) 2500 V |
(b) 25000V |
(c) 2510V |
(d) Zero |