Spider: A biologist is using a magnifying glass to look for insects in the jungle. On Day 22, after cataloging 232 different kinds of insects, she finds a spider instead. When she looks through the magnifying glass, she sees an image of the spider 15.7 cm behind the lens and magnified by a factor of 18. (The spider's image is on the same side of the lens as the spider.) (a) What is the focal length of the magnifying glass? (b) The biologist notices the spider is looking back at her! The biologist's eye is 7.6 cm from the lens. What does the spider see looking through the lens? I.e., where is the image of the biologist's eye formed, and what is its magnification?

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You have a thin, diverging lens.  If the value of q (the distance from the image to the mirror along the principal axis of the mirror) is -2.59cm and the distance of p (the distance from the object to the mirror along the principal axis of the mirror) is 23.36cm, what is the focal length of the diverging lens?

You have a thin, diverging lens. If the value of q (the distance from the image to the mirror along the principal axis of the mirror) is -3.57cm and the distance of p (the distance from the object to the mirror along the principal axis of the mirror) is 17.16cm, what is the focal length of the diverging lens? Object Ray 1 Principal focal point Virtual image Diverging lens Ray 1 Ray 3 Ray 2 Secondary focal point |fl ·|fl· Note: Do not explicitly include units in your answer (it is understood the unit is cm). Enter only a number. If you do enter a unit, your answer will be counted wrong.