The nickel's image in the figure below has four times the diameter of the nickel when the lens is 2.75 cm from the nickel. Determine the focal length of the lens (in cm).

If the distance of the object is 250 cm and the distance of the image is 140 cm, I say that the focal length is 390 cm. true or false

An object (height = 7.7 cm) and its image are on opposite sides of a converging lens. The object is located 14.0 cm from the lens. The image is located 5.6 cm from the lens. Determine the image height (in cm). Enter the numerical part of your answer to two significant figures. Hint: Remember that the sign of the image height is significant.

You hold a magnifying glass 4.0 cm above  1.98 mm-long bug and the image is 5.44 mm long. What is the focal length of the lens? Please give your answer in cm.

An object of height 7.91cm is placed 40 cm from a converging lens of focal length 11.1 cm. How big is the image? (hint: you should find the image distance first) To continue, enter your answer in cm.   Round your answer to 1 decimal place.

Work with your neighbors to fill in the table below. If a number has (+) written in front of it, then you must determine if the number should be positive or negative. mirror type concave focal radius of length curv. (+)20 cm +20 cm -40 cm object image magnifi- distance distance cation +10 cm +10 cm +30 cm -10 cm 1.0 real or virtual? inverted. or not?

ONLY ANSWER IN SCIENTIFIC NOATION USING E IF YOU CAN NOT DO BOTH DO NOT RESPOND THANKS

d, d; In the picture above, you know the distance from the lens to the object, d, = 7cm, and the distance from the mirror to the image, d; %3D = 4.6cm. The position of the focal point must be at i cm. (Record your answer to two decimal places.)

A spherical concave lens has a focal length of 50 cm, and an object is placed 20 cm from the lens. Draw a ray diagram. (Submit a file with a maximum size of 1 MB.) Choose File No file chosen Estimate the image distance. cm

Shown in the figure below is a system containing two lenses and an object. The focal lengths of the two lenses are f1 = -19 cm and f2 = 9.5 cm. The two lengths indicated in the figure are L1 = 28.5 cm and L2 = 15.2 cm. Determine all the following about the image from the first lens only:Object distance for the first lens, d01.  cmImage distance for the first lens, di1.  cmMagnification of the first lens, m1. The second lens uses the image from the first lens as its object. Determine all the following about the image from the second lens:Object distance for the second lens, d01.  cmImage distance for the second lens, di1.  cmMagnification of the second lens, m1. Determine the magnification of the whole system, mtot. Select the correct attributes of the final image of the system: virtual real     enlarged shrunk     upside down right side up