- Is always real.
- Is always virtual.
- Is certainly real if the object is virtual.
- Is certainly virtual if the object is real.
Explanation:
| Object | Image |
| O1 | I1 |
| O2 | I2 |
| O3 | I3 |
| O4 | I4 |
Here O4 is virtual oblect & I4 is real image.

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The process of superimposing signal frequency (i.e. audio wave) on the carrier wave is known as
|
(a) Transmission |
(b) Reception |
(c) Modulation |
(d) Detection |
The minimum temperature of a body at which it emits light is
|
(a) 1200°C |
(b) 1000°C |
(c) 500°C |
(d) 200°C |
Focal length of a convex lens will be maximum for
|
(a) Blue light |
(b) Yellow light |
(c) Green light |
(d) Red light |
Assertion : Free electron always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it.
Reason : The average velocity of free electron is zero.
|
(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. |