4. A concave mirror has a focal length of 25 cm. How far from the mirror should

Question

4. A concave mirror has a focal length of 25 cm. How far from the mirror should you place an object so you get a real and inverted image that is twice as large as the object? 12.5 cm 2) 37.5 cm 50 cm 4) 75 cm 5) 100 cm 5. In the diagrams below the solid arrow represents the object and the dashed arrow represents the image. The rectangle shows the position ofa SINGLEOPTICAL What are appropriate optical elements? ELEMENT. 1) A-convex mirror, B- concave mirror 2) A-convex mirror, B-converging lens 3) A diverging lens, B converging lens 4) A-diverging lens, B-convex mirror 5) A-diverging lens, B convave mirror 6. An object is placed 20 cm in front of convex mirror. The resulting image is erect and half the size of the object. What is the focal length of the mirror? 1) -40 cm. 2) 20 cm 3) 10 cm 4) 10 cm 5) 40 cm 7. A near sighted person cannot see objects clearly beyond 80 cm. If contact lenses are prescribed, what is the power ofthe lens required to comect the patient's far vision? 1) 1.25 diopters 2) 1.5 diopters 2.0 diopters 2.5 diopters -4.0 diopters

Explanation / Answer

According to the chegg guidelines I am allowed to answer only 1 question at a time .

1) focal length = 25.0 cm

v= 2u

1/F = 1/v + 1/u

1/F = 1/2u + 1/u

= 25.0 cm * 3 /2 = 75.0 cm / 2 = 37.5 cm ===========================ANSWER) OPTION B)

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