AIPMT 2010 Prelims | Geometrical Optics Question 54 | Physics

AIPMT 2010 Prelims

MCQ (Single Correct Answer)

-1

A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter $${d \over 2}$$ in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively

$$f\,$$ and $${I \over 4}$$

$${{3f} \over 4}$$ and $${I \over 2}$$

$$f$$ and $${{3I} \over 4}$$

$${f \over 2}$$ and $${I \over 2}$$

AIPMT 2010 Prelims

MCQ (Single Correct Answer)

-1

A ray of light travelling in a transparent medium of refractive index $$\mu $$, falls on a surface separating the medium from air at an angle of incidence of 45^o. For which of the following value of $$\mu $$ the ray can undergo total internal reflection ?

$$\mu $$ = 1.33

$$\mu $$ = 1.40

$$\mu $$ = 1.50

$$\mu $$ = 1.25

AIPMT 2008

MCQ (Single Correct Answer)

-1

Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial. The power of the combination is

$${{{f_1} + {f_2}} \over 2}$$

$${{{f_1} + {f_2}} \over {{f_1}{f_2}}}$$

$$\sqrt {{{{f_1}} \over {{f_2}}}} $$

$$\sqrt {{{{f_2}} \over {{f_1}}}} $$

AIPMT 2008

MCQ (Single Correct Answer)

-1

A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is 1.39 $$ \times $$ 10⁹ m and its mean distance from the earth is 1.5 $$ \times $$ 10¹¹ m. What is the diameter of the sun's image on the paper ?

6.5 $$ \times $$10^$$-$$5 m

12.4 $$ \times $$10^$$-$$4 m

9.2 $$ \times $$10^$$-$$4 m

6.5 $$ \times $$10^$$-$$4 m

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