Visible spectrum of the light has a wavelength in the range of: A. 1000 to 4000 Ao B. 4000 to 7000 Ao C. 7500 to 12500 Ao D. 12500 to 30000 Ao 42. What is a dolly ?

• A. a heavy tripod
• B. a remote flash
• C. a camera case
• D. none of these