A concave lens has a focal length of -39 cm. Find the image distance and magnification that result when an object is placed 31 cmin front of the lens

For a thin lens situaiton, you have detemined the image distance is negative. Which of the following must be true?     the image is real, it is on the opposite side as the object     the image is virtual, it is on the same side as the object     the image is real, it is on the same side as the object     the image is virtual, it is on the opposite side as the object

I need help please.

A concave lens has a focal length of -7 cm. A candle with a height of 5 cm is 25 cm away from the lens. Find the location of the image. If the image is real give a positive answer and a virtual image should be a negative answer.

A 1.00-cm-high object is placed 4.30 cm to the left of a converging lens of focal length 8.45 cm. A diverging lens of focal length -16.00 cm is 6.00 cm to the right of the converging lens. Find the position and height of the final image. position height cm ---Select--- cm

A spherical concave lens has a focal length of 50 cm, and an object is placed 25 cm from the lens. Draw a digram.  Estimate the image distance Is it real or virtual upright or inverted magnified or reduced

Two identical diverging lenses are separated by 18 cm. The focal length of each lens is -8.0 cm. An object is located 4.0 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right. cm

What power of spectacle lens is needed to correct the vision of a nearsighted person whose far point is 40.0 cm? Assume the spectacle (corrective) lens is held 1.80 cm away from the eye by eyeglass frames

convex spherical mirror with a radius of curvature of 16.5 cm produces a virtual image one half the size of the real object. Where is the object? cm (from the mirror)

The distance from the lens of a particular eye to the retina is 1.96 cm. What is the focal length of the lens when the eye produces a clear image of an object 35.9 cm away? cm