Passage II

A hologram is a three-dimensional image produced when light from a laser shines on a film coated with a material called a holographic emulsion. The laser provides the light at a specific wavelength.

The figure below shows the light energy per unit area (in ergs/cm2) required to create a hologram on 3 different emulsions using gas lasers. For example, an Ar laser must produce 100 ergs/cm2 to create a hologram on Emulsion 2. The figure also shows how the sensitivity to light of each emulsion and the light energy per unit area required to create a hologram on each emulsion vary with the wavelength of light used.

10. Based on the figure, which of the emulsions is/are more sensitive to light at 500 nm than to light at 425 nm?

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

Looking at Emulsion 1 & 3, the abscissa 450 corresponds to a higher ordinate, indicating that emulsion 1 & 3 are sensitive to 450 nm light, and A & H & J are excluded;

Looking at Emulsion 2, when the abscissa is 500, the corresponding ordinate is higher, indicating that emulsion 2 is sensitive to light at 500 nm