A lens of power – 2 dioptres is placed in contact with a lens of power + 1 dioptre. The combination will behave like:
A. A convergent lens of focal length 100 cm
B. A divergent lens of focal length 100 cm
C. A divergent lens of focal length 50 cm
D. A convergent lens of focal length 50 cm
Answer:B
A lens of power – 2 dioptres is placed in contact with a lens of power + 1 dioptre. The combination will behave like:
A. A convergent lens of focal length 100 cm B. A divergent lens of focal length 100 cm C. A divergent lens of focal length 50 cm D. A convergent lens of focal length 50 cm