1
AIPMT 2010 Prelims
+4
-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 45o. For which of the following value of $$\mu$$ the ray can undergo total internal reflection ?
A
$$\mu$$ = 1.33
B
$$\mu$$ = 1.40
C
$$\mu$$ = 1.50
D
$$\mu$$ = 1.25
2
AIPMT 2010 Prelims
+4
-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
A
$$f\,$$ and $${I \over 4}$$
B
$${{3f} \over 4}$$ and $${I \over 2}$$
C
$$f$$ and $${{3I} \over 4}$$
D
$${f \over 2}$$ and $${I \over 2}$$
3
AIPMT 2008
+4
-1
Two thin lenses of focal lengths f1 and f2 are in contact and coaxial. The power of the combination is
A
$${{{f_1} + {f_2}} \over 2}$$
B
$${{{f_1} + {f_2}} \over {{f_1}{f_2}}}$$
C
$$\sqrt {{{{f_1}} \over {{f_2}}}}$$
D
$$\sqrt {{{{f_2}} \over {{f_1}}}}$$
4
AIPMT 2008
+4
-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 ?
A
6.5 $$\times$$10$$-$$5 m
B
12.4 $$\times$$10$$-$$4 m
C
9.2 $$\times$$10$$-$$4 m
D
6.5 $$\times$$10$$-$$4 m
EXAM MAP
Medical
NEET