Quiz - 4 - Diving Knowledge Workbook - Diving Physics

[Pedro Burrito]

From the Diving Physics Section of the PADI Diving Knowledge Workbook Version 2.02 © PADI 2009:

1.2 Question 2

When viewed underwater, objects normally appear ___ by a ratio of about ___ (actual to apparent distance).

a. closer / 2:1

b. further away / 4:3

c. closer / 4:3

d. further away / 2:1​

I will post a daily question from my exams to help newer divers and to encourage more experienced divers to interact gracefully and helpfully with the newer divers.

Reminder - this is a post in the Basic Forum and it is a green zone. Please be nice and on topic.

Thank you for your patience while we try to give people something to discuss other than Covid-19 and/or Politics. I will post the answer covered by the spoiler tag later today.

 

[scubadada]

...and how much larger?

 

[MargaritaMike]

Didn't you read the answers? It says it plain as day. And who says it's larger? Are you trying to be a spoiler?

Have a GREAT day!

Cheers,
M²

 

[TMHeimer]

No doubt someone will mention visual reversal and ask what % of time you're looking at close stuff vs. far away stuff, or what % of time you're diving in more turbid or less turbid water.

 

[scubadada]

Spoiler

Take it easy @MargaritaMike it's for fun

 

[Jcp2]

But the shark was this big! Huge! Almost ate my arm!

 

[Pedro Burrito]

Spoiler: Answer

c. closer / 4:3

Light passing through the water / air interface refracts (bends). The effect is similar to an object being viewed under a magnifying glass. If no other factors come into play, objects will appear closer by a ratio of about 4:3.

 

[scubadada]

Spoiler: Answer

c. closer / 4:3

and about 1/3 larger

 

[Pedro Burrito]

and about 1/3 larger

You spoiled the next question that I just posted.

 

[scubadada]

You spoiled the next question that I just posted.

Whoops, sorry about that, was answering my own question from earlier Quiz - 4 - Diving Knowledge Workbook - Diving Physics