1
AIEEE 2007
+4
-1
Two lenses of power $$-15$$ $$D$$ and $$+5$$ $$D$$ are in contact with each other. The focal length of the combination is
A
$$+ 10\,cm$$
B
$$- 20\,cm$$
C
$$- 10\,cm$$
D
$$+ 20\,cm$$
2
AIEEE 2006
+4
-1
The refractive index of a glass is $$1.520$$ for red light and $$1.525$$ for blue light. Let $${D_1}$$ and $${D_2}$$ be angles of minimum deviation for red and blue light respectively in a prism of this glass. Then,
A
$${D_1} < {D_2}$$
B
$${D_1} = {D_2}$$
C
$${D_1}$$ can be less than or greater than $${D_2}$$ depending upon the angle of prism
D
$${D_1} > {D_2}$$
3
AIEEE 2005
+4
-1
A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is $${4 \over 3}$$ and the fish is $$12$$ $$cm$$ below the surface, the radius of this circle in $$cm$$ is
A
$${{36} \over {\sqrt 7 }}$$
B
$${36\sqrt 7 }$$
C
$${4\sqrt 5 }$$
D
$${36\sqrt 5 }$$
4
AIEEE 2005
+4
-1
A thin glass (refractive index $$1.5$$) lens has optical power of $$-5$$ $$D$$ in air. Its optical power in a liquid medium with refractive index $$1.6$$ will be
A
$$-1$$ $$D$$
B
$$1$$ $$D$$
C
$$-25$$ $$D$$
D
$$25$$ $$D$$
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