Please help me in these questions

PHY 1120 Homework 8 1. A concave mirror can be the heating mechanism for a solar cooker. If a concave mirror focuses the Sun's rays 17.2 cm in front of the mirror, what is the radius of the spherical surface from which the mirror was made? 2. Acandleis placed 35 cm in front of a concave mirror. The mirror has a radius of curvature of 21 cm. a) What is the focal length of the mirror? b) Where will the image of the candle be located? In other words, find di. c) Will the image be upright or inverted? 3. The speed of light in ice is 2.29 x 10 m/s. What is the index of refraction of ice? 4. What is the angle of refraction for a flashlight beam that strikes a sheet of glass (ngiass = 1.56) at an angle of 65 to the normal? Assume the light is passing through air before it hits the glass. 5. Aclearly defined image is located 380 mm behind a 212 mm focal length converging lens. Find the object distance a) using a ray diagram (this will likely be a rough estimate). b) by calculation (be attentive with your signs for f, do and di) 6. Itis asunny day and you pause on a hike to make a fire at a fire pit. Your friend removes a lens from their pocket and gathers a small pile of dry leaves. The move the lens until the sunlight focuses through the lens on the leaves, a spot 29.0 cm behind the lens. The leaves smolder and then begin to burn. a. What kind of lens is it (converging or diverging)? b. What is the len's power in diopters? (units of Diopters are m)