1
JEE Main 2017 (Offline)
+4
-1
A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15cm from a converging lens of magnitude of focal length 20cm. A beam of parallel light falls on the diverging lens. The final image formed is:
A
real and at a distance of 6 cm from the convergent lens.
B
real and at a distance of 40 cm from convergent lens.
C
virtual and at a distance of 40 cm from convergent lens.
D
real and at a distance of 40 cm from the divergent lens.
2
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
To determine refractive index of glass slab using a travelling microscope, minimum number of readings required are :
A
Two
B
Three
C
Four
D
Five
3
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
A hemispherical glass body of radius 10 cm and refractive index 1.5 is silvered on its curved surface. A small air bubble is 6 cm below the flat surface inside it along the axis. The position of the image of the air bubble made by the mirror is seen :

A
14 cm below flat surface
B
30 cm below flat surface
C
20 cm below flat surface
D
16 cm below flat surface
4
JEE Main 2016 (Online) 9th April Morning Slot
+4
-1
To find the focal length of a convex mirror, a student records the following data :

Object
Pin
Convex
Lens
Convex
Mirror
Image
Pin
22.2 cm 32.2 cm 45.8 cm 71.2 cm

The focal length of the convex lens is f1 and that of mirror is f2. Then taking index correction to be negligibly small, f1 and f2 are close to :
A
f1 = 12.7 cm    f2 = 7.8 cm
B
f1 = 7.8 cm    f2 = 12.7 cm
C
f1 = 7.8 cm    f2 = 25.4 cm
D
f1 = 15.6 cm    f2 = 25.4 cm
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