Light from sodium lamp is made to pass through two polaroids placed one after the other in the path of light. Taking the intensity of the incident lig

Question

Light from sodium lamp is made to pass through two polaroids placed one after the other in the path of light. Taking the intensity of the incident lig

Light from sodium lamp is made to pass through two polaroids placed one after the other in the path of light. Taking the intensity of the incident light as `100%`, the intensity of the out coming light that can be varied in the range
A. `0% " to " 100%`
B. `0% " to " 50%`
C. `0% " to " 25%`
D. `0% " to " 75%`

Monjur Alahi

7 views

2025-01-04 04:42

1 Answers

Related Questions

A lamp is placed at a distance of 16 cm, from a photocell and the current observed is 1 mA. If the distance from the lamp is reduced to 8 cm, the phot

2 Answers 4 Views

The act of photoelectric effect taking place with a certain photosensitive metal depends upon (i) frequency annd (ii) intensity of the incident radiat

2 Answers 4 Views

A 100 W sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light

2 Answers 4 Views

A 100 W sodium lamp radiates radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sod

2 Answers 4 Views

The polariser and analyser are inclined to each other at `60^(@)`. The intensity of polarised light emerging from polariser is I. The intensity of the

2 Answers 6 Views

Two polaroids are crossed to each other. One of them is rotated through `60^(@)`, what % age of incident unpolarised light will pass through the syste

2 Answers 4 Views

In an electric circuit, potential difference across a lamp is 20 V and current through the lamp is 0.5A. The resistance of the lamp is

2 Answers 4 Views

Upolarised light of intensity 32 W `m^(-2)` passes through three polarisers such that transmission axis of first is crossed with third. If intensity o

2 Answers 4 Views

A 100W sodium lamp radiates energy uniformly in all directions. The lamp is located at the center of a large sphere that absorbs all the sodium light

2 Answers 10 Views

5. Radha had been using an inexpensive filament-based light bulb which gives off yellow/orange light to lit her room. Now, as she has started earning, she wants to bring home a tubular lamp which involves a two-step process of generation of light and gives off white light after blinking for a few seconds. Identify the lightinper her requirement.

2 Answers 7 Views

Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - B
Let `I_(0)` be the intensity of incident light. As the light coming from sodium lamp is unpolarised, so the intensity of light emerging from the first polaroid is
`I_(1)=(I_(0))/(2)`
If `theta` is the angle between two polaroids, then the intensity of light emerging from the second polaroid is
`I_(2)=I_(2)"cos"^(2)theta=(I_(0))/(2)cos^(2)theta`
But `I_(0)=100%` (given)
` :. I_(2)=50%"cos"^(2)theta`
Since `theta` varies from `90^(@)` to `0^(@)`, so the intensity of the out coming light can be varied from `0%` to `50%`.