7. Referring to the figure 2, calculate the image distance if a point object is situated in the medium of refractive index ni at a distance of
(a) 50 cm and
(b) 4 cm
from the spherical surface of radius of curvature 5 cm if ni and n2 are
1.0 and 1.52 respectively.​

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.