A convex lens is placed on a flat glass plate and illuminated from above with monochromatic red light. When viewed from above, concentric bands of red and dark are observed. What does one observe at the exact center of the lens where the lens and the glass plate are in direct contact?

A) a darkspotB) a bright spot thatis some color other than redC) a bright redspotD) a rainbow of color

Question

Physics

Valentino Osborne

29 November, 18:08

A convex lens is placed on a flat glass plate and illuminated from above with monochromatic red light. When viewed from above, concentric bands of red and dark are observed. What does one observe at the exact center of the lens where the lens and the glass plate are in direct contact?

A) a darkspotB) a bright spot thatis some color other than redC) a bright redspotD) a rainbow of color

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Answers (1)

Know the Answer?

Nancy Owens · Answer 1

The answer is: A) a darkspot

Explanation:

When the red light passes through the glass plate, it is scattered. the convex lens (convergent lens) has two refractive surfaces, therefore, in the center of the lens, a characteristic dark spot would be observed.