A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should be microscope moved to get the mark in focus again

Question:

Options :

(a) 1cm downward
(b) 2cm upward
(c) 1cm upward
(d) 4.5cm downward

Answer :

Answer Steps :

step 1

step 2

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Two resistors having equal resistances are joined in series and a current is passed through the combination. Neglect any variation in resistance as the temperature changes. In a given time interval (a) Equal amount of thermal energy must be produced in the resistors(b) Unequal amounts of thermal energy may be produced (c) The temperature must rise equally in the resistors (d) The temperature must rise unequally in the resistors

If current in an electric bulb changes by 1%, then the power will change by (a) 1%(b) 2%1000 OF(c) 4% anda darse(d) =%2

Two bulbs X and Y having same voltage rating and of power 40 watt and 60 watt respectively are connected in series across a potential difference of 300 volt, then

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If current in an electric bulb changes by 1%, then the power will change by (a) 1%(b) 2%1000 OF(c) 4% anda darse(d) =%2

Two bulbs X and Y having same voltage rating and of power 40 watt and 60 watt respectively are connected in series across a potential difference of 300 volt, then

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