1
AIPMT 2003
+4
-1
A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
A
become zero
B
become infinite
C
become small, but non-zero
D
remain unchanged
2
AIPMT 2003
+4
-1
An equiconvex lens is cut into two halves along (i) XOX' and (ii) YOY' as shown in the figure. Let $$f,f',$$ $$f''$$ be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively.

Choose the correct statement from the following A
$$f' = f,f'' = 2f$$
B
$$f' = 2f,f'' = f$$
C
$$f' = f,f'' = f$$
D
$$f' = 2f,f'' = 2f$$
3
AIPMT 2002
+4
-1
A bulb is located on a wall. Its image is to be obtained on a parallel wall with the help of convex lens. The lens is placed at a distance d ahead of second wall, then required focal length will be
A
only $${d \over 4}$$
B
only $${d \over 2}$$
C
more than $${d \over 4}$$ but less than $${d \over 2}$$
D
less than $${d \over 4}$$
4
AIPMT 2002
+4
-1
Diameter of human eye lens is 2 mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50 meter from eye. The wavelength of light is 5000 $$\mathop A\limits^ \circ$$
A
2.32 m
B
4.28 mm
C
1.25 cm
D
12.48 cm
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