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Draw a diagram showing a normal iris and what happens to the iris when a light in shined into the human eye. (1 mark). What causes this to happen? (2 marks)

(Any diagram showing an iris that has constricted) 1 mark
In high light levels (1 mark) Accept reflex action due to increased photoreceptor action or words to that effect
circular muscles relax ...

Answered by James P. • Biology tutor

2262 Views

For all values of x f(x) = x^2 + 2 g(x)= x - 5 show that fg(x) = x^2 -10x +27

Firstly, we have to substitute g(x) into the function f(x)So, fg(x) = (g(x))^2 +2
Next we must rewrite the equation on the RHS in terms of x only
So, fg(x) = (x-5)^2 +2
Next we must simpli...

Answered by Yasmin S. • Maths tutor

7403 Views

What velocity should your boat have if you want to cross a 72m wide river in 6s by the shortest distance, with a 5 m/s downstream current?

Key physics concepts: Velocity vectors, Distance/speed/time relations Key mathematical concepts: Trigonometry, Pythagorean triples, Vector addition/subtraction.Recall that velocity is a vector

Answered by • Physics tutor

1656 Views

What are the different types of price discrimination that can be employed?
First-degree price discrimination, alternatively known as perfect price discrimination, occurs when a firm charges a different price for every unit consumed. The firm is able to charge the maximum possibl...
Answered by • Economics tutor
1736 Views

How is blood glucose levels controlled by the body (homeostasis) ?
Controlling high blood glucoseBlood glucose levels are important to control because glucose is our key source of energy in respiration. When blood glucose levels are too high, this...
NB
Answered by Nazeya B. • Biology tutor
2541 Views

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Top answers

Draw a diagram showing a normal iris and what happens to the iris when a light in shined into the human eye. (1 mark). What causes this to happen? (2 marks)

For all values of x f(x) = x^2 + 2 g(x)= x - 5 show that fg(x) = x^2 -10x +27

What velocity should your boat have if you want to cross a 72m wide river in 6s by the shortest distance, with a 5 m/s downstream current?

What are the different types of price discrimination that can be employed?

How is blood glucose levels controlled by the body (homeostasis) ?

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