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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
1 views

___ causes the pupil to widen.

  1. a. Low light
  2. b. Bright light

Summary Introduction

Introduction: The light enters the eye through the pupil at the centre of iris and is passed onto lens. The lens focuses light and image on the retina. The smooth muscle of iris adjusts according to the conditions of light.

Explanation

Reason for the correct statement:

The iris adjusts the shape of the pupil and controls the amount of light that enters the eye. The pupil widens in low light and shrinks in bright light.

Hence, option a. is correct...

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