A compound microscope is made with an objective lens (f, = 0.90 cm) and an eyepiece (f. = 1.1 cm). The lenses are separated by a distance of 10 cm. If an object is 1.0 cm in front of the objective lens, where will the final image of the eyepiece be located? a. -30 b. -15 e. -23 d. -11 e. -9

A concave lens has a focal length of -45 cm. a) Find the image distance that results when an object is placed 32 cm in front of the lens. b) Find the magnification that results when an object is placed 32 cm in front of the lens.

A boy with myopia has an abnormal far point of 80.0 cm. What power of corrective lens is needed to accurately adjust his vision? Neglect the distance between the eye and the corrective lens. a. -2.00 D b. -1.25 D C. -1.75 D d. -1.50 D e. -2.25 D

An object is 19 cm in front of a diverging lens that has a focal length of -13 cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 2.3? Number -18.98 Units cm

A microscope has a 12.0x eyepiece and a 59.0x objective lens 20.0 cm apart. What is the focal length in centimeter of the eyepiece? A. 1.26. B. 2.08. C. 2.45. D. 3.19. E. 3.57

20. This question is about convex lenses. (a) A convex (converging) lens is u d to project an image onto a screen. The focal length of the lens is 10 cm. The object is placed at a distance of 15 cm from the centre of the lens on the principal axis. (i) Define principal axis. (ii) Construct rays to locate the position of the image. 15 cm object principal axis f f 10 cm 10 cm convex lens (iii) Identify the nature of the image.

5. Q7) Problem 53: Page 110 A camera with a 50 mm focal length lens is being used to photograph a person standing 3.00 m away. (a) How far from the lens must the film be? (b) If the film is 36 mm high, what fraction of a 1.75 m-tall person will fit on it? Note: First find Magnification then consider film height as image height and find the object height and compare it with1.75 m. (Ans: 0.0508 m, 100%)

6. An object is placed 8.5 cm in front of a convex (converging) spherical lens. Its image forms 3.9 cm in front of the lens. What is the focal length of the lens? * O 19 cm 9.6 cm 2.7 cm 6.1 cm 口 L

An eyeglass prescription that specifies a power of -1.0 diopters is describing a lens that has a focal length of O a. + 1 meter O b.- 100 cm O C. - 1 meter O d. - 1 cm An object placed 25 cm to the left of a +20 cm focal length lens produces a real image 100 cm to the right of the lens. What is the magnification? O a. - 4 Ob. - 0.25 O C. + 2 O d. - 1

5. Consider a converging lens that has a focal length (f). Which one of these is correct about the image when the object is placed in front of the lens at a distance of (3f)? The image is real, inverted, and diminished The image is real, erect, and diminished The image is real, erect, and magnified The image is virtual, inverted, and magnified The image is virtual, inverted, and diminished The image is virtual, erect, and has the same size as the object A nearsighted man uses his ideally prescribed eyeglasses that have a refractive power of -3.00 diopters. He would like a prescription for contact lenses. What is the correct contact lens prescription if he normally wears his eyeglasses a distance of 2.1 cm from his eyes? diopters