A simple microscope has:
- A2 convex lens
- B2 concave lens
- C1 convex lens
- D1 concave lens
A simple microscope has:
Explanation:
A simple microscope is made up of a single convex lens fitted in a round metallic frame with a handle.
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Monochromatic green light of wavelength 5 illuminates a pair of slits 1 mm apart. The separation of bright lines on the interference pattern formed on a screen 2 m away is
|
(a) 0.25 mm |
(b) 0.1 mm |
(c) 1.0 mm |
(d) 0.01 mm |
The frequency of 1st line of Balmer series in
atom is
. The frequency of line emitted by singly ionised He atom is
|
(a) 2 |
(b) 4 |
(c) |
(d) |
Magnetic meridian is a
|
(a) Point |
(b) Horizontal plane |
(c) Vertical plane |
(d) Line along N-S |
The count rate of a Geiger- Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to 5
after 2 hours. The initial count rate was
|
(a) 25 |
(b) 80 |
(c) 625 |
(d) 20 |
At zero Kelvin a piece of germanium
|
(a) Becomes semiconductor |
(b) Becomes good conductor |
|
(c) Becomes bad conductor |
(d) Has maximum conductivity |
In the figure, an air lens of radii of curvature 10 cm (
= 10 cm) is cut in a cylinder of glass (μ = 1.5). The focal length and the nature of the lens is

|
(a) 15 cm, concave |
(b) 15 cm, convex |
|
(c) ∞, neither concave nor convex |
(d) 0, concave |