Place one of the diverging lenses on a sheet of paper and trace its outline. Wit
ID: 1615976 • Letter: P
Question
Place one of the diverging lenses on a sheet of paper and trace its outline. Without altering the lens position, arrange the light box to project several parallel rays and move it so that it projects the rays parallel to the axis of symmetry of the lens. Trace the rays. The rays will diverge as they leave the lens. Trace the refracted rays back to the point in front of the lens from which they seem to be coming. Mark this point. This is the focal point of the lens. Measure the focal length of this lens (the distance from the focal point to the center of the lens) and record it on your drawing. (Since this focal point lies in front of the mirror and the rays do not actually go through it, the focal length of a diverging mirror is said to be a negative focal length.) As with the mirror, trace the curve of one side of the lens surface on your sheet of paper. Move the curved surface along this tracing and extend the tracing a number of times until it forms a circle. Measure the diameter of the circle and calculate the radius. Record these results on your drawing. Look at the Lens-makers' Equation again. Since n is always greater than 1 and the focal length for a diverging lens must be negative, what must be the sign of the radii of the sides of a bi-concave mirror? Does this make sense in comparison to the direction of curvature of the sides of a bi-convex lens? use your measured radii and focal length to determine the index of re refraction of the plastic used for this lens. Is the diverging lens made of the same material as the converging lens?Explanation / Answer
According to the question
We know that
6)
It is negative here
9)
for 9th one ans is the diverging lens is made up of the same material as that of convex lens