MCQ
The angular magnification of a simple microscope can be increased by increasing
- Afocal length of lens
- Bsize of object
- Caperature of lens
- ✓power of lens
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Statement $-1$ : Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals
Statement $-2$ : The state of ionosphere varies from hour to hour, day to day and season to season

Assertion $A :$ The escape velocities of planet $A$ and $B$ are same. But $A$ and $B$ are of unequal mass.
Reason $R :$ The product of their mass and radius must be same, $M _{1} R _{1}= M _{2} R _{2}$
In the light of the above statements, choose the most appropriate answer from the options given below